MHT CET 2026 Physics question
100 balls each of mass m moving with speed v simultaneously strike a wall normally and reflected back with same speed, in time t s. The total magnitude of force exerted by the balls on the wall is
Answer: (B)
Solution
Each ball reverses its velocity, so the change in momentum of one ball is . For 100 balls the total change of momentum is , occurring in time . Force = rate of change of momentum $=
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