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  4. A body is falling under gravity. When it loses a gravitational potential energy by U, its speed is v. The mass of the body shall be:

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Q. A body is falling under gravity. When it loses a gravitational potential energy by $U$, its speed is $v.$ The mass of the body shall be:

Work, Energy and Power

Solution:

Gain in $KE =$ Loss in $PE$
or $\frac{1}{2} m v^{2}=U$
or $m=\frac{2 U}{v^{2}}$