Question

A truck and a car moving with the same kinetic energy are brought to rest by application of brakes which provide equal total retarding force for both. The truck has 8 tyres, and weighs 4 times more than the car which has 4 tyres. What can you say about the distance in which the two vehicles stop?

• A. The car will stop at a shorter distance.
• B. The truck will stop at a shorter distance.
• C. They will stop at the same distance.
• D. Not enough information is given.

Answer 1

Answer: (C)

They will stop at the same distance.

$Workdone=Force\times displacement=ChangeinK.E$

The truck and the car move with the same kinetic energy. They are brought to rest by application of brakes which provide equal total retarding force for both.

Hence, they will stop at the same distance.