A disc of mass 100 g is kept floating horizontally in air by firing bullets, each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound with the same speed in opposite direction. The velocity of each bullet at the time of impact is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Force on disc due to change in momentum of bullets is balanced by weight of the disc.
i.e., 2 m' 
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