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A ball strickes a horizontal floor at an...

A ball strickes a horizontal floor at an angle `theta = 45^@` with the normal to floor. The coefficient of restitution between the ball and the floor is `e = 1//2`. The fraction of its kinetic energy lost in the collision is.

A

`5/8`

B

`3/8`

C

`3/4`

D

`1/4`

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