A man standing on a cliff throws a rock at 25° above the horizontal with an initial velocity of 15 m/s. If the rock is in the air for 5 seconds, how tall is the cliff, and how far into the ocean does it travel? Solution 1. Determine what is given and what needs to be found. 2. Draw and label a diagram. 3. Set up the equation for the x-and y ... A thrown baseball has kinetic energy. Potential energy is energy of motion. If a car's speed increases then its kinetic energy increases. 8. Two identical books are on the same shelf. They have different amount of potential 9. A toaster uses elastic potential energy to make toast. 10. Two skiers with different masses are at the top of the same ...