Velma is in a train moving north at 20 m/s. She throws a stone toward the rear of the train, at 5 m/s relative to herself. Mort, standing beside the tracks, sees the stone move
A) south at 15 m/s.
B) north at 20 m/s.
C) south at 25 m/s.
D) north at 25 m/s.
E) north at 15 m/s.

Question

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The Answer of Velma is in a train moving north at 20 m/s. She throws a stone toward the rear of the train, at 5 m/s relative to herself. Mort, standing beside the tracks, sees the stone move
A) south at 15 m/s.
B) north at 20 m/s.
C) south at 25 m/s.
D) north at 25 m/s.
E) north at 15 m/s.

Velma Is in a Train Moving North at 20 M/s