Teeing Off A golf club has a lightweight flexible shaft with a heavy block of wood or metal (called the head of the club) at the end. A golfer making a long shot off the tee uses a driver, a club whose 300g head is much more massive than the 46g ball it will hit. The golfer swings the driver so that the club head is moving at 41m/s just before it collides with the ball. The collision is so rapid that it can be treated as the collision of a moving 300g mass (the club head) with a stationary 46g mass (the ball); the shaft of the club and the golfer can be ignored. The collision takes 7.2ms , and the ball leaves the tee with a speed of 71m/s.
What is the speed of the club head immediately after the collision?