JEE Main Physics question
An open carriage in a goods train is moving with a uniform velocity of 10 ms⁻¹. If the rain adds water with zero velocity at the rate of 5 kgs⁻¹, then the additional force applied by the engine to maintain the same velocity of the train is
Answer: (C)
Solution
The train must accelerate the added mass to its own speed: F = v(dm/dt) = 10×5 = 50 N.