Students from Professor Kuo's class only came to office hours on Wednesday this week. There were two students who needed help on two of the homework problems. The first was a problem that mixed energy and kinematics. You needed to find the final velocity of a box at the top of a ramp, given that it had energy from a compressed spring. Then you needed to use the final velocity to see how far it would travel before landing.
The second question involved a cart that rolled downhill, back uphill higher than it started, and then landed on a frictional surface. You needed to use energy conservation to find out how far it traveled on the frictional surface before stopping.
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