A body of mass 2,kg makes an elastic collision with another body at rest and continues to move in or

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5.Work, Energy, Power and Collision

normal

A body of mass $2\,kg$ makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed, The mass of the second body which collides with the first body is ............... $\mathrm{kg}$

$2$

$1.2$

$3$

$1.5$

Solution

$\mathrm{m}_{1}=2 \mathrm{kg}$ and $\mathrm{v}_{1}=\left(\frac{\mathrm{m}_{1}-\mathrm{m}_{2}}{\mathrm{m}_{1}+\mathrm{m}_{2}}\right) \mathrm{u}_{1}=\frac{\mathrm{u}_{1}}{4}(\text { given })$

By solving we get $\mathrm{m}_{2}=1.2 \mathrm{kg}$

Standard 11

Physics

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A body of mass $2\,kg$ makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed, The mass of the second body which collides with the first body is ............... $\mathrm{kg}$

Solution

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