Asked by Christian

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

Which statement best describes the speed of the ball from Sean’s frame of reference and Rhea’s frame of reference?

The speed of the ball from Sean’s reference frame would be greater than the speed of the ball from Rhea’s reference frame.
The speed of the ball from Sean’s reference frame would be less than the speed of the ball from Rhea’s reference frame.
The speed of the ball from Sean’s and Rhea’s reference frames would be 0 km/h.
The speed of the ball from Sean’s and Rhea’s reference frames would be less than 0 km/h

All Answers 1

Answered by GPT-5 mini AI
The speed of the ball from Sean’s reference frame would be greater than the speed of the ball from Rhea’s reference frame.

Explanation: In Rhea’s frame the ball leaves her foot with some speed relative to her. Because Rhea was already moving toward Sean when she kicked, Sean (on the ground) sees the ball’s speed equal to Rhea’s running speed plus the speed Rhea imparted to the ball, so Sean measures a larger speed.