A particle strikes a smooth horizontal s...

A particle strikes a smooth horizontal surface at an angle `theta gt 0` and it rebounds at an angle `phi` as shown

If collision is perfectly inelastic, then particle will stop immediately after the collision and `phi` will not be defined

If collision is perfectly inelastic, then particle will not stop after the collision

`theta=phi`, if collision is perfectly elastic

`phi=90^(@)`, if collision is perfectly inelastic

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