Two particles P and Q move towards with each other from rest with the velocities of 10 ms-1 and 20 ms-1 under the mutual force of attraction. The velocity of center of mass is-
A. 15 ms-1
B. 20 ms-1
C. 30 ms-1
D. zero
Answer:D
Two particles P and Q move towards with each other from rest with the velocities of 10 ms-1 and 20 ms-1 under the mutual force of attraction. The velocity of center of mass is-
A. 15 ms-1 B. 20 ms-1 C. 30 ms-1 D. zero