JEE Main Physics question
A 500 kg car, moving with a velocity of 36 km h⁻¹ on a straight road unidirectionally, doubles its velocity in one minute. The power delivered by the engine for doubling the velocity is
Answer: (D)
Solution
u = 10 ms⁻¹, v = 20 ms⁻¹. Work = ΔKE = ½(500)(20²−10²) = 250(300) = 75000 J. Power = 75000/60 = 1250 W.