Abaseball of mass 250g, pitched with a speed of 40m/s is caught by the catcher, whose glove moves backward 0.25m while stopping the ball. what was the kinetic energy of the ball before it was caught?

While a guitar string is vibrating, you gently touch the midpoint of the string to ensure that the string does not vibrate at that point. which normal modes cannot be present on the string while you are touching it in this way?