1.A 45.3-g golf ball is driven from the tee with an initial speed of 50.6 m/s and rises to a height of 21.4 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 5.46 m below its highest point?

2.A basketball player makes a jump shot. The 0.600-kg ball is released at a height of2.09m above the floor with a speed of7.52m/s. The ball goes through the net3.10m above the floor at a speed of4.13 m/s. What is the work done on the ball by air resistance, a nonconservative force