. Make sure to use energy arguments only. Do not use kinematics to solve the problems. . Answer all questions on your own sheets of paper. 1. A crate was pushed down a frictionless ramp. Its initial speed at the top of the ramp was 3.2 m/s. Its speed when it reached the bottom of the ramp was 9.7 m/s. The ramp makes an angle of 25 with the horizontal. How long is the ramp? [5 marks] 2. A wrecking ball hangs from a crane on 10.0 m of cable. If the crane swings the wrecking ball so that the wrecking ball is at rest when the cable makes an angle of 30.0 to the vertical, what will the speed of the wrecking ball be as it falls back to the vertical position? [5 marks]