A stone of mass 1 kg tied on one end of light string is whirled in vertical circle as shown in figur

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5.Work, Energy, Power and Collision

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A stone of mass $1\ kg$ tied on one end of the light string is whirled in vertical circle as shown in figure. Tension in the string when the string becomes horizontal is ......... $N$

A

$20$

B

$30$

C

$40$

D

$50$

Solution

velocity when string becomes horizontal

$\mathrm{v}=\sqrt{\mathrm{u}^{2}-2 \mathrm{g} \ell}=\sqrt{60-20}$

$\mathrm{v}=\sqrt{40}$

$\Rightarrow \mathrm{T}=\frac{\mathrm{mv}^{2}}{\ell}=\frac{1(40)}{1}$

$\Rightarrow \mathrm{T}=40 \mathrm{N}$

Standard 11

Physics

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