Mass doesn’t affect speed directly. It determines how quickly an object can change speed (accelerate) under the action of a given force. Lighter objects need less time to change speed by a given amount under a given force.

Friction is a force that opposes motion. When two objects are in contact, friction is acts in a direction opposite to the motion of the object.

Speed (s) – Rate at which an object is moving. Like distance, speed does not depend on direction.

Speed can be defined as the distance traveled divided by the total time taken. So, speed = distance/time. While velocity can be defined as the displacement divided by the total time taken.

You can use the equivalent formula d = rt which means distance equals rate times time. To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time. To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

Rate of change in position, or speed, is equal to distance traveled divided by time. To solve for time, divide the distance traveled by the rate. For example, if Cole drives his car 45 km per hour and travels a total of 225 km, then he traveled for 225/45 = 5 hours.

The velocity can be specified at any particular instant of time. For example, if the position is changing quickly the velocity is large and if the position is not changing at all the velocity is zero. A mathematical way to represent this definition is. Thus, velocity is measured in meters per second (m/s).

Speed is the rate of change of distance(basically how much distance(m) has been covered in a particular time(s)). Velocity is the rate of change of displacement( change of distance in a particular direction with respect to time) , and acceleration is the rate of change of velocity per unit of time.

In the equation V = d/t, V is the velocity, d is the distance and t is the time. For example, if your initial velocity was 3 m/s and your object acceleration is 4 m/s, your final velocity is 7 m/s (3 + 4 = 7).

Provided an object traveled 500 meters in 3 minutes , to calculate the average velocity you should take the following steps:

1. Change minutes into seconds (so that the final result would be in meters per second). 3 minutes = 3 * 60 = 180 seconds ,
2. Divide the distance by time: velocity = 500 / 180 = 2.77 m/s .

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).

The ratio of distance travelled and the time taken by a body can be zero but not negative. Since distance and time are positive quantities and speed is obtained by the ratio of these two quantities, speed cannot be negative.

There is nothing like negative speed. It s a scalar quantity and it is always positive. There exist something analogous to speed is velocity. Velocity is a vector quantity and it can be negative, because it is depends on direction.

When inflation is 3 percent, and the interest rate on a loan is 2 percent, the lender’s return after inflation is less than zero. In such a situation, we say the real interest rate—the nominal rate minus the rate of inflation—is negative.