From Eq(7-1), the velocity and acceleration of the cm are: m, VIt m2 1 cn 21+m (7-4) +m a (7-6) m,+m Can we also find cm is zero from Eg(7-6? 11a1+m2a E+ F 0From Eq. (7-1), the velocity and acceleration of the CM are: (7-4) (7-6) 1 2 1 1 2 2 m m m v m v dt d r v cm cm + + = = → → → → 1 2 1 1 2 2 m m m a m a dt d v a cm cm + + = = → → → → Can we also find is zero from Eq. (7 cm -6)? a  → → → → + = F r + F r m a m a 1 1 2 2 1 2 = 0 → c a → → F2r = − F1r