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A body projected vertically upwards with a velocity $u$ returns to the starting point in 4 seconds. If $g=10 \mathrm{~m} / \mathrm{sec}^2$, the value of $u$ is
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20 m/sec
Time of flight $T=\frac{2 u}{g}=4 \mathrm{sec};u=20 \mathrm{~m} / \mathrm{s}$
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