An explosion blows a rock into three parts. Two parts go off at right angles to each other NEET 2009

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An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 m s^(−1) and 2 kg second part moving with a velocity 8ms^(−1). If the third part flies off with a velocity of 4ms^(−1), its mass would be
(a) 7 kg (b) 17 kg (c) 3 kg (d) 5 kg
(2009)

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