$A$ ball of mass $m$ falls vertically from a height $h$ and collides with $a$ block of equal mass $m$ moving horizontally with $a$ velocity $v$ on $a$ surface. The coefficient of kinetic friction between the block and the surface is $0.2$, while the coefficient of restitution $e$ between the ball and the block is $0.5.$ There is no friction acting between the ball and the block. The velocity of the block decreases by
$A$ ball of mass $m$ falls vertically from a height $h$ and collides with $a$ block of equal mass $m$ moving horizontally with $a$ velocity $v$ on $a$ surface. The coefficient of kinetic friction between the block and the surface is $0.2$, while the coefficient of restitution $e$ between the ball and the block is $0.5.$ There is no friction acting between the ball and the block. The velocity of the block decreases by
- A
$0$
- B
$0.1 \sqrt {2gh}$
- C
$0.3 \sqrt {2gh}$
- D
can’t be said
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