1. A cannonball is launched with an initial speed of 20 m/s. Calculate the maximum height the ball could reach. 2. The cannonball from the problem above returns to the same starting height, but with a speed of 18 m/s. Describe how this either IS or IS NOT consistent with the law of conservation of mechanical energy. If this IS NOT consistent, then describe where the “extra” energy may have come from or been moved to.

3. The cannonball is now changed to be one of double the mass, but the SAME launch speed. What happens to the maximum height of the cannonball? Assume no air resistance. (Initial speed of 20 m/s)