Question

a truck and a car moving with same kinetic energy are stopped by applying same retarding force by means of brakes. which stops at a smaller distance?

Answer 1

The truck has greater mass and thus greater momentum,so the car will stop first because of lesser momentum.
hope this helps...
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Answer 2

The Answer Is Same Distance,How

Applying Work Energy Theorem

W=ΔK.E.=K.E(f)-K.E.(i).

For Truck(F=Retarding Force)

F*S(T)=0-K.E(T)-----------(1)

For Car

F*S(C)=0-K.E(C)-----------(2)

Diving 1 By 2

S(T)=S(C)  [As K.E.(T)=K.E.(C)]

Hence Both Will Travel Same Distance After Application Of Same Retarding Force.