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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

‘N’ number of balls of mass ‘m’ kg moving along positive direction of x-axis, strike a wall per second and return elastically. The velocity of each ball is ‘u’ m/s. The force exerted on the wall by the balls in newton, is [MHTCET 2023]

Answer: (A)

Solution

Each ball changes momentum by , and N balls strike per second, so ; mNu

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Question ID VK-062486