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A stone is thrown at an angle Ф to the horizontal reaches a maximum height H. Then the time of flight of stone will be:

(answer should come 2√2H / √g



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R = u² sin 2Ф / g

H = u² sin² Ф / 2g        2Hg = u² sin² Ф

total time of flight is = 2 u sin Ф/g  =  2/g [ √2Hg ] = 2√(2H/g)

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