A block moving | Work, Energy and Power | JEE-MAIN 2021

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JEE MAIN 2021

31.08.21_S2

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A block moving horizontally on a smooth surface with a speed of $40 \mathrm{~ms}^{-1}$ splits into two equal parts. If one of the parts moves at $60 \mathrm{~ms}^{-1}$ in the same direction, then the fractional change in the kinetic energy will be $x: 4$ where $x=$ $\_\_\_\_$ .

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