Question

A truck and car has same kinetic energy.their engines are made off simultaneously.whuch one will stop at lesser distance

Answer 1

Answer by:- Serley

Let the mass of the car = m and mass of the truck = M 
Let the velocities of the car and truck is v and V respectively. 
Given the kinetic energy of car = kinetic energy of truck 
Or, ½ mv^2 = ½ MV^2 or, mv^2 = MV^2 
Since M>m, therefore v>V. 
Also, Normal force on truck is greater than the car so is the friction force. 
Thus, the truck will stop in lesser distance