JEE Main Physics question
A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/hour in 5 sec. The average power of the engine during this period in watts is (neglect friction)
Answer: (B)
Solution
Final velocity = 54 km/hr = 15 m/s. KE gained = ½(1000)(15)² = 112500 J. Average power = KE/t = 112500/5 = 22500 W.