High-Speed Stroboscopic Photographs Show That the Head of a Golf

Short Answer

High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is travelling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact.