Q98 / 180 · AIIMS 2014 · Physics

A heavy truck moving with a velocity of $60 \mathrm{~km} \mathrm{~h}^{-1}$ collides with a light drum at rest. If the collision be elastic, then the velocity of the drum immediately after collision will be

  • A
    zero
  • B
    $60 \mathrm{~km} \mathrm{~h}^{-1}$
  • Correct answer
    C
    $120 \mathrm{~km} \mathrm{~h}^{-1}$
  • D
    uncertain

Solution

In an elastic collision of a very heavy body with a very light body at rest, the speed of lighter body becomes twice the speed of the heavier body, i.e., $v_2=2 u_1=120 \mathrm{~km} \mathrm{~h}^{-1}$.

Hence, the correct answer is option: 'C'.

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