Work equal to 25,J is done on a mass of 2,kg to set it in motion. If whole of it is used to increase

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5.Work, Energy, Power and Collision

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Work equal to $25\,J$ is done on a mass of $2\,kg$ to set it in motion. If whole of it is used to increase the kinetic energy then velocity acquired by the mass is ............ $\mathrm{m}/ \mathrm{s}$

A

$5$

B

$12.5$

C

$25$

D

$50$

Solution

$\mathrm{W}=\Delta \mathrm{K}$

$25=\frac{1}{2} \mathrm{mv}^{2}=\frac{1}{2} \times 2 \times \mathrm{v}^{2}$

$\mathrm{v}=5 \mathrm{m} / \mathrm{s}$

Standard 11

Physics

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