You drop a ball from roof.it takes 2 sec to reach ground.what is height of the roof?
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Assume that g = 9.8m/s²
S = ut + 0.5*at² = 0 + 0.5*9.8*2² = 19.6m
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S = ut + 0.5*at² = 0 + 0.5*9.8*2² = 19.6m
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