A child standing on a frictionless skateboard throws a ball straight upward

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A child standing on a frictionless skateboard throws a ball straight upward. For the system consisting of the child, the skateboard, and the ball, is the gravitational force acting on the ball internal or external to the system? (Answer with “internal” or “external.”)

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