Question

A 4 kg mass and a 1 kg mass are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

Easy

Solution

$P = \sqrt{2 mE} .$ If E are const. then $\frac{P_{1}}{P_{2}} = \sqrt{\frac{m_{1}}{m_{2}}} = \sqrt{\frac{4}{1}} = 2$

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