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

A ball is projected from the point `O` with velocity `20m//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 `75/k` meter. Find the value of `k`? `(g=10m//s^(2))`

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4
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