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A particle of mass m is projected at an angle of 60o with a velocity of 20 m/s relative to the ground from a plank of same mass m which is placed on a smooth surface initially plank was at rest. The minimum length of the plank for which the ball will fall on the plank itself is (a) 40√3 (b) 20√3m (c) 10√3m (d) 60√3m
(a) Since the mass is same therefore the length of the plank should be twice the range
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