(A) : Two particles (starting from rest) move towards each other under a mutual force of attraction. The velocity of their c.m is zero.
(R ) : Internal forces do not alter the state of motion of c.m.

Options

A. Both (A) and (R ) are true and (R ) is the correct explanation of (A)
B. Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
C. (A) is true but (R ) is false
D. Both (A) and (R ) are false

Answer

A