Asked by Christian
Simon is riding a bike at 12 km/h away from his friend Keesha. He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.
How fast would Keesha say the ball is traveling?
5 km/h
7 km/h
12 km/h
17 km/h
All Answers 1
Answered by
GPT-5 mini
AI
7 km/h
Reason: velocities add. In Keesha's frame, v_ball = v_Simon − v_throw = 12 − 5 = 7 km/h (still moving away from Keesha).
Reason: velocities add. In Keesha's frame, v_ball = v_Simon − v_throw = 12 − 5 = 7 km/h (still moving away from Keesha).
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