Velocity and speed are calculated using the same units such as kilometers per hour (km/h), meter per second (m/s) and miles per hour (mph).

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2).

a = vi = vf – at. v = vf = at + vi.

s=vt where s is the displacement, v the (constant) speed and t the time over which the motion occurred….Equations of Motion.

Which equation is most likely used to determine the acceleration from a velocity vs. time graph? a = t over delta v.

An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).

Yes, a body can have positive velocity and negative acceleration at the same time.

Yes, the velocity of an object can be negative when its acceleration is positive and vice versa. An example of such a situation is when an object is launched vertically upwards and moves freely under the action of gravity.

(2) When we throw a ball upwards, then also negative acceleration acts on it. Thus, when the ball reaches the highest point, the velocity of the ball becomes zero.

Mathematically, a negative acceleration means you will subtract from the current value of the velocity, and a positive acceleration means you will add to the current value of the velocity. And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.

A positive acceleration means an increase in velocity with time. negative acceleration means the speed reduces with time. When the car slows down, the speed decreases. When an object is speeding up, the acceleration is in the same direction as the velocity.

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.

If the velocity of the body increases, acceleration is said to be positive. Similarly, if the velocity decreases, the acceleration is said to be negative. Retardation is acceleration with a negative sign. Or the negative value of acceleration shows that the velocity of a body is decreasing.

Negative acceleration is calculated by dividing the final velocity minus the initial velocity by the amount of time taken by the body to reduce the velocity. If the velocity is in the positive direction, negative acceleration indicates that the object is slowing down.

Deceleration always refers to acceleration in the direction opposite to the direction of the velocity. Deceleration always reduces speed. Therefore, it has negative acceleration in our coordinate system, because its acceleration is toward the left.

What is the difference between negative acceleration and retardation? When the acceleration is acting in a direction opposite to the velocity, it is called called retardation. Similarly we can take the direction of the velocity to be positive, and if acceleration is opposed to it is called negative acceleration.

Speed is the distance covered in a unit of time while acceleration is the rate of change of speed. The unit of speed in the metric system is meters per second (m/s) while that of acceleration is meters per second squared (m/s2). Speed is a scalar quantity while acceleration is a vector quantity.

1 Expert Answer Speed is just the magnitude part of the velocity. Acceleration is the change in velocity over a period of time. It would momentarily have zero speed at the top of its motion, but the velocity is not zero, because the direction of the object’s motion is changing from upward to downward.

Answer: Yes, an object can have zero velocity and still be accelerating simultaneously. Let us consider an object moving in the forward direction.

For the most part velocity is not zero if an object is accelerating. Since acceleration is the change in velocity over time, there has to be a change in velocity for something to accelerate. If the velocity is constant however, the acceleration is zero (because the velocity isn’t changing over time).

so if the velocity does not change with time the acceleration is necessarily zero. Since in your example the velocity is constant during the interval that means dv/dt=0 and therefore that a=0 during the interval.

When acceleration is zero (that is, a = dv/dt = 0), rate of change of velocity is zero. That is, acceleration is zero when the velocity of the object is constant. Motion graphs represent the variations in distance, velocity and acceleration with time.

If velocity is 0 , that means the object is not moving, but with acceleration present, there is a force acting on the object. A common example is the vertex of an inverted parabola (along the x -axis). Velocity slows to a halt, but is subjected to an acceleration of 9.8 ms2 [down] .

Because the person always returns to the original position, the motion would never result in a change in position. Since velocity is defined as the rate at which the position changes, this motion results in zero velocity.

Constant velocity means the acceleration is zero. The change in velocity over a certain time interval equals the area under the acceleration graph over that interval. In this case the velocity does not change, so there can be no area under the acceleration graph.

Acceleration tells you how fast the velocity changes. So, if you get a velocity of zero, if doesn’t mean the acceleration is zero; when velocity is very high, cceleration doesn’t have to be high as well, and it can be zero or negative too!!

The sign of the velocity depends on the coordinate system chosen to define the position. A positive velocity simply means that the object is moving in the positive direction, as defined by the coordinate system, while a negative velocity means the object is traveling in the other direction.

An object moving in the negative direction (negative velocity) is speeding up. A positive velocity means it’s going in the positive direction (like forwards), and a negative direction is backwards.

Negative velocity just means velocity in the opposite direction than what would be positive.

If velocity and acceleration have the same sign, you speed up. If velocity and acceleration have opposite signs, you slow down. Negative velocity = You move backwards. Negative acceleration = You slow down or you go faster in the backwards direction.