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A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

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A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is
A. 2mu
B. mu
C. zero
D. `-2"mu"`
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Correct Answer - D
The situation is a shown in the figure
image
`p_("initial")="mu", p_("final")=-"mu"`
Impulse imparted to the ball=Change in momentum
`=p_("final")=p_("initial")=-"mu"-"mu"=-2"mu"`
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