Mass of the car m = 1500 kg
Velocity of the car v = 60 km/h
={60×1000\over60×60}={50\over3}m/s
The car is in motion, so its energy = kinetic energy = {1\over2}𝑚𝑣2
={1\over2}(1500) ({ 50\over3 })^2 J
={1\over2}× (1500) × {2500\over9} J
= 208333.3 J
The kinetic energy of the car, when it comes to rest = 0 J
Work done on object = change in kinetic energy
= 208333.3 − 0 J
= 208333.3 J
Hence, the work required to stop the car is 208333.3 J.
