Q. A 2.0 m-long cylindrical steel wire with a cross-sectional diameter of 4.0 mm is placed over a light, frictionless pulley, with one end of the wire connected to a 5.0 kg object and the other end connected to a 3.0 kg object. By how much does the wire stretch while the objects are in motion?
Q. A 47 g golf ball is driven from the tee with an initial speed of 58 m/s and rises to a height of 23 m.
(a) avoid air resistance and determine the kinetic energy of the ball at its highest point.
(b) What is its speed when it is 10.00 m below its highest point?