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Q.

A rigid ball of mass m strikes a rigid wall at 600 and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be

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a

mv

b

2mv

c

mv2

d

mv3

answer is A.

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Detailed Solution

As we know Impulse = Change in momentum. Now along the wall there is no change momentum. The change in momentum perpendicular to the wall is mvCos600-(-mvCos600) =2mvCos600=mv
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A rigid ball of mass m strikes a rigid wall at 600 and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be