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Question

A ball is thrown upward with an initial speed $${ v }_{ 0 }=15$$ m /s at an angle of $${ 30 }^{ \circ }$$ with the horizontal. The thrower stands near the top of a long hill which slopes downward at an angle of $${ 20 }^{ \circ }$$.
i) When does the ball strike the slope ?
ii) How far down slope the-ball strikes ?
iii) With what velocity the ball strikes ?

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