human
Question: A student is standing on a skateboard that is not moving. The total mass of the student and the skateboard is 50 kilograms. The student throws a ball with a mass of 2 kilograms forward at 5 m/s. Assuming the skateboard wheels are frictionless, how will the student and the skateboard move?

Choices:
A) forward at 0.4 m/s
B) forward at 5 m/s
C) backward at 0.2 m/s
D) backward at 5 m/s
gpt
The correct answer is 3: backward at 5 m/s.