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1st Equation of Motion

A body projec...

Question

A body projected vertically upwards with a velocity u return to the starting point in 4second .If $g = 10 m^{- 2}$ the value of u is $(m / s)$ :-

A

5

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B

20

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C

40

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D

10

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Solution

The correct option is D 20
Total time in the air $= 4 s e c .$
time for to reach the peak $= 4 \times 0.5 = 2 s e c .$
$0 = u + (- 10) \times 2 u = 20 m / s$

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