A body projected vertically upwards with a velocity P \( u \) retur...

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A body projected vertically upwards with a velocity
P \( u \) returns to the starting point in 4 seconds. If \( g=10 \)

W \( \mathrm{m} / \mathrm{sec} \), the value of \( u \) is
(1) \( 5 \mathrm{~m} / \mathrm{sec} \)
(2) \( 10 \mathrm{~m} / \mathrm{sec} \)
(3) \( 15 \mathrm{~m} / \mathrm{sec} \)
(4) \( 20 \mathrm{~m} / \mathrm{sec} \)
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