posted by Kelley .
High-speed stroboscopic photographs show
that the head of a 212 g golf club is trav-eling at 29.8 m/s just before it strikes a 45.9 g
golf ball at rest on a tee. After the collision,
the club head travels (in the same direction)
at 21.8 m/s.
Find the speed of the golf ball immediately