A body projected vertically upwards with a velocity u returns to starting point in 4 ,seconds . If g

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2.Motion in Straight Line

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A body projected vertically upwards with a velocity $u$ returns to the starting point in $4 \,seconds$. If $g = 10m/sec^2$, the value of $u$ is.........$m/sec$

A

$5$

B

$10$

C

$15$

D

$20$

Solution

(d)Time of flight $T = \frac{{2u}}{g} = 4\;\sec \Rightarrow u = 20\;m/s$

Standard 11

Physics

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