A body projected vertically upwards with a velocity \( u \) returns to the starting point in 4 s...

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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
[KCET 1999; RPMT 2006]
(a) \( 5 \mathrm{~m} / \mathrm{sec} \)
(b) \( 10 \mathrm{~m} / \mathrm{sec} \)
(c) \( 15 \mathrm{~m} / \mathrm{sec} \)
(d) \( 20 \mathrm{~m} / \mathrm{sec} \)
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