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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 2020]

Answer: (B)

Solution

Each ball's momentum change is , and N balls strike per second, so ; mNu would result

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Question ID VK-062407