A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g = 10 m/s2) nearly :
(1) 1.4 kg m/s
(2) 0 kg m/s
(3) 4.2 kg m/s
(4) 2.1 kg m/s.
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