A ball of mass m strikes a rigid wall with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is
A
2mu
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B
mu
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C
zero
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D
−2mu
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Solution
The correct option is D−2mu The situation is as shown in the figure. pinitial=mu,pfinal=−mu Impulse imparted to the ball = change in momentum =pfinal−pintial =−mu−mu=−2mu