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A ball strikes the ground at an angle al...

A ball strikes the ground at an angle `alpha.` and rebound at an angle `beta.` with the verticlal as shown in the figure .Then ,

A

coefficient of restitution is `(tanalpha)/(tan beta)`

B

`alphaltbeta` the collision is inelastic

C

if `alphaltbeta` the collision is elastic

D

if `alpha>beta` the collision is inelastic

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