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According to law of conservation of momentum,total momentum before collision=total momentum after collision.Suppose a ball of mass m moving with velocity v strikes the wall and rebounds back with the same velocity.Then according to law of conservation of momentum: mv+0=mv+0.But is not correct.Why?
since each object experiences equal and opposite impulses, it follows logically that they must also experience equal and opposite momentum changes. As an equation, this can be stated as