Question: A rock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal

A rock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range d.
(a) At what angle ' is the rock thrown?
(b) What If? Would your answer to part (a) be different on a different planet?
(c) What is the range dmax the rock can attain if it is launched at the same speed but at the optimal angle for maximum range?

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