Question

Mr. Starr pushed a cart full of groceries to his 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?



(1 point)
Responses

When it was empty, the cart had less kinetic energy.
When it was empty, the cart had less kinetic energy.

When it was full, the cart had less kinetic energy.
When it was full, the cart had less kinetic energy.

The cart had the same kinetic energy going each way.
The cart had the same kinetic energy going each way.

The cart's kinetic energy depends on Mr. Starr's mass.

Answer 1

When it was empty, the cart had less kinetic energy.

Explanation: kinetic energy = 1/2 m v^2. The speed v is the same each way, but the mass m is larger when the cart is full, so the full cart has more kinetic energy.