MHT CET 2022 Physics question
A wall is hit elastically and normally by 'n' balls per second. All the balls have the same mass 'm' and are moving with the same velocity 'u'. The force exerted by the balls on the wall is
Answer: (B)
Solution
In an elastic normal collision each ball rebounds with the same speed, so its change in momentum is . The force equals the rate of change of momentum: .
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