Rhea is running towards Sean and kicks a soccer ball to him. Sean is standing still.

Sean is standing still, so his reference frame matches the ground’s frame. Rhea is running toward Sean in the same direction the ball travels, so the ball’s speed measured from Rhea is reduced by her own forward motion. Thus the ball is moving faster in Sean’s frame than in Rhea’s frame. The correct choice is A, the ball’s speed from Sean’s frame would be greater.

AI-written and checked against the verified answer.