question_answer

A lorry and a car with the same kinetic energy are brought to rest by the application of the brakes which provide equal retarding force. Which of them will come to rest in a shorter distance?

Answer:

                By work-energy theorem, Loss in K.E. of the vehicle \[=\]Work done against retarding force \[=\]Retarding force x distance travelled \[\therefore \]Distance travelled \[\text{=}\frac{\text{Loss in K}\text{.E}}{\text{Retarding force}}\] As both the kinetic energy and retarding force are same, so both the lorry and the car would come to rest in the same distance.