The velocities of three particles of masses 10 kg, 20 kg and 30 kg are 10i, 10j and 10k m/s, respectively. What is the velocity of their centre of mass?

The velocities of three particles of masses 10 kg, 20 kg and 30 kg are

1.	The velocities of three particles of masses 10 kg, 20 kg and 30 kg are 10i, 10j and 10k m/s, respectively. What is the velocity of their centre of mass?
A.	(i + 2j + 3k) m/s
B.	10 (i + j + k) m/s
C.	(10i + 20j + 30k) m/s
D.	(3i + 2j + k) m/s
Answer» B. 10 (i + j + k) m/s

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The velocities of three particles of masses 10 kg, 20 kg and 30 kg are 10i, 10j and 10k m/s, respectively. What is the velocity of their centre of mass?

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