A ball is projected from the point O wit...

A ball is projected from the point O with velocity 20 `m//s` at an angle of `60^(@)` with horizontal as shown in figure. At highest point of its trajectory it strikes a smooth plane of inclination `30^(@)` at point A. The collision is perfectly inelastic. The maximum height from the ground attained by the ball is `(g=10 m//s^(2))`

`18.75`m

15 m

`22.5` m

`20.25` m

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