When a particle is thrown vertically upwards, its velocity at one third of its maximum height is 10

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2.Motion in Straight Line

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When a particle is thrown vertically upwards, its velocity at one third of its maximum height is $10 \sqrt{2}\,m / s$. The maximum height attained by it is .......... $m$

A

$20 \sqrt{2}$

B

$30$

C

$15$

D

$12.8$

Solution

(c)

$v^2-u^2=-2 g \times \frac{2 H}{3}$

$\Rightarrow-100 \times 2=-2 \times 10 \times \frac{2 H}{3}$

$\Rightarrow H=15 \,m$

Standard 11

Physics

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