Answer :

Initially the car is at rest, the speed of the car = 0 m/s

We need to accelerate the car to a speed of = 72km/h = 20 m/s


Kinetic energy at this speed = (1/2) ×500×20×20 = 105 J


The change in kinetic energy = 105 m/s


The work done in this process = change in kinetic energy


= 105-0 = 105 J


Also, we know that work done = force × displacement


Force = work done/ displacement = 100000/25 = 4000 N


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