A solid disc of mass M is just held in air horizontally by throwing 40 stones per sec vertically upwards to strike the disc each with a velocity 6 ms -1 . If the mass of each stone is 0.05kg what is the mass of the disc 
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Verified by ExpertsThe correct answer is:
A
Weight of the disc will be balanced by the force applied by the bullet on the disc in vertically upward direction.
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