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JEE MAIN_2023
S2_25.01.23
Question
A body of mass 1 kg collides head on elastically with a stationary body of mass 3 kg. After collision, the smaller body reverses its direction of motion and moves with a speed of 2m/s. The initial speed of the smaller body before collision is ______$\mathrm{ms}^{-1}$.
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