Physics · 2020
JEE Main · 3 September 2020, Shift 2 · Q3
A block of mass 1.9 kg is at rest at the edge of a table, of height 1 m. A bullet of mass 0.1 kg collides with the block and sticks to it. If the…
A block of mass $\displaystyle 1.9$ kg is at rest at the edge of a table, of height $\displaystyle 1$ m . A bullet of mass $\displaystyle 0.1$ kg collides with the block and sticks to it. If the velocity of the bullet is $\displaystyle 20$ m/s in the horizontal direction just before the collision then the kinetic energy just before the combined system strikes the floor, is [Take $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$. Assume there is no rotational motion and loss of energy after the collision is negligable.]
Official answer
(2)
$\displaystyle 21$ J
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.