Three interacting particles of masses 1.0 kg, 2.0 kg and 4.0 kg have each a velocity of 1 ms-' magnitude along the positive direc- tion of x, y and z-axis respectively. Due tc forces of interaction the third particle stops and the velocity of second particle becomes 2j+k ms', the velocity of the first particle is (B) i-2/+2k (C) 2i+3j-k (D) -i+3j+k

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