High-speed stroboscopic photographs show that the head of a 280 g golf club is traveling at 42 m/s just before?

High-speed stroboscopic photographs show that the head of a 280 g golf club is traveling at 42 m/s just before it strikes a 46 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 36 m/s. Find the speed of the golf ball just after impact.