Three particles of masses 100 g, 200 g and 400 g initially move at 20 m s⁻¹ along +x,+y,+z respectively. After interaction the third stops and the second has velocity 10 $\hat{i}+5\hat{k}$ . Velocity of the first is:
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Question

Three particles of masses 100 g, 200 g and 400 g initially move at 20 m s⁻¹ along +x,+y,+z respectively. After interaction the third stops and the second has velocity 10 $\hat{i}+5\hat{k}$ . Velocity of the first is:

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G1 Physics · Accepted Answer

Use p = mv and conservation of total linear momentum for an isolated system. Resolving components with the given data gives A: 20i+20j+70k.

Three particles of masses 100 g, 200 g and 400 g initially move at 20 m s⁻¹ along +x,+y,+z respectively. After interaction the third stops and the second has velocity 10 i ^ + 5 k ^ \hat{i}+5\hat{k} i ^ + 5 k ^ . Velocity of the first is: