Physics · 2020
JEE Main · 2 September 2020, Shift 1 · Q3
A particle of mass m with an initial velocity u i collides perfectly elastically with a mass 3 m at rest. It moves with a velocity v j after…
A particle of mass $\displaystyle m$ with an initial velocity $\displaystyle u \hat{i}$ collides perfectly elastically with a mass $\displaystyle 3$ m at rest. It moves with a velocity $\displaystyle v \hat{j}$ after collision, then, $\displaystyle v$ is given by :
Official answer
(3)
$\displaystyle v=\frac{\mathrm{u}}{\sqrt{2}}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.