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  4. A heavy truck moving with a velocity of 60 km 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

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

AIIMSAIIMS 2014Work, Energy and Power

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., v2 = 2u1 = 120 km h-1 .