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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

An engine accelerates a car of mass 800 kg from rest to a speed of 72 km h⁻¹ in 32 s. If the frictional force is 10 N per ton, the average power developed by the engine is

Answer: (D)

Solution

Speed = 72 km/h = 20 ms⁻¹. KE gained = ½(800)(20²) = 1.6×10⁵ J. Average power =

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Question ID VK-153817