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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A train is moving with velocity 20 m/s on this dust is falling at the rate 50 kg/min. The extra force required to move the train with a constant velocity will be

Answer: (A)

Solution

Extra force = v·(dm/dt) = 20 × (50/60) = 16.66 N.

Question ID VK-152891