A ball is thrown upward with speed 10 ,m / s from top of tower reaches ground with a speed 20 ,m / s

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2.Motion in Straight Line

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A ball is thrown upward with speed $10 \,m / s$ from the top of the tower reaches the ground with a speed $20 \,m / s$. The height of the tower is ......... $m$ [Take $g=10 \,m / s ^2$ ]

A

$10$

B

$15$

C

$20$

D

$25$

Solution

(b)

$v=\sqrt{u^2+2 g h}$

$\Rightarrow(-20)^2=10^2+2 \times 10 \times h$

$\Rightarrow \frac{300}{2 \times 10}=h \Rightarrow h=15 \,m$

Standard 11

Physics

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