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A ball collides directly with another ba...

A ball collides directly with another ball at rest and is brought to rest by the impact. If half of the initial kinetic energy is lost in the impact, then the coefficient of restitution is

A

`frac{3}{4}`

B

`frac{1}{sqrt2}`

C

`frac{1}{4}`

D

`frac{1}{2}`

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