Question

Suppose a car is mowing along a flat piece of road. Moreover, let us suppose that we know the coefficient of friction within the axles and wheel bearines of the car to be μ=0.015. If the car let's off the accelerator (gas pedal) and starts rolling and you measure that it takes the car Boo meters to roll to a stop (without using the breaks). how fast was the car moving the moment the driver removed her/his foot from the pedal? Give your answer in units of m/s, however do not include the units explicitly in your answer. If you include units, the answer will be counted wrong.

Answer 1

The car is traveling at a speed of 6.7 m/s

Once the foot is removed from the gas pedal, the car will start to slow down . This is because it no longer has any force being applied to it. This means that the car will stop moving after a certain distance has passed.

If it takes the car B m to come to a complete stop, then the speed of the car will be V=B/T where T is the amount of time it took to stop (in seconds)

By using these formulas you can find the answer of 6.7m/s