A heavy truck moving with a velocity of 60 ~km ~h^ -1 collides with...

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

Options

Azero
B $60 \mathrm{~km} \mathrm{~h}^{-1}$
C $120 \mathrm{~km} \mathrm{~h}^{-1}$
Duncertain

Correct answer

C. $120 \mathrm{~km} \mathrm{~h}^{-1}$

Step-by-step 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}

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