Q.

The adjacent figure shows an infinite frame of two sides in a gravity free space. What is the final constant kinetic energy expected of the ball of mass m projected as shown with an initial velocityv0 . The coefficient of restitution for the collision between the ball and the frame is e = 0.5

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a

0.5mv02

b

0.25mv02

c

0.125mv02

d

0.325mv02

answer is B.

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Detailed Solution

The component of velocity perpendicular to sides is finally lost after a long time K.E=12m(v02)2
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The adjacent figure shows an infinite frame of two sides in a gravity free space. What is the final constant kinetic energy expected of the ball of mass m projected as shown with an initial velocityv0 . The coefficient of restitution for the collision between the ball and the frame is e = 0.5