Question

A remote control car has a mass of `15.5kg` and is accelerating on the road. The car starts from rest and reaches a velocity of `11m/s[E]` in `19.5s`. What is the force applied by the car on the road? Neglect frictional forces.

Answer 1

F = ma, but in this case, a = gravity

Explanation:

The force the car applies to the road is independent of how fast it is going. This is a distractor question to see if you understand that difference. So, your answer is simply `15.5 kg * 9.8 m/s^2`.

Note that if the roadway is pitched to an angle, that downward force will change, but it is still independent of the speed the car is traveling.