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:A
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