Mr. Starr pushed a cart full of groceries to this car. After emptying the
cart, he pushed it back to the store. He pushed the cart at a speed of
2 meters per second each way. Which is the best prediction?
When it was full, the cart had less kinetic energy.
The cart had the same kinetic energy going each way.
When it was empty, the cart had less kinetic energy.
The cart's kinetic energy depends on Mr. Starr's mass.