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sir where am i wrong ?this is page39momentum module

sir where am i wrong ?this is page39momentum module

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Grade:11

1 Answers

Aziz Alam IIT Roorkee
askIITians Faculty 233 Points
6 years ago
You have taken that the momentum is conserved in this example of page 39.
The momentum is not conserved for the combined system of two masses, because there is net external force.Hence the problem is solved by taking into account that momentum change of system is equal to external impulse on the system.

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