Physics · 2021
JEE Main · 25 July 2021, Shift 1 · Q21
A body of mass 2 kg moving with a speed of 4 m/s. makes an elastic collision with another body at rest and continues to move in the original…
A body of mass $\displaystyle 2$ kg moving with a speed of $\displaystyle 4$ m/s. makes an elastic collision with another body at rest and continues to move in the original direction but with one fourth of its initial speed. The speed of the two body centre of mass is $\displaystyle \frac{x}{10} \mathrm{~m} / \mathrm{s}$. Then the value of $\displaystyle x$ is
\_\_\_\_.
Official answer
25
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.