You and Al are both floating freely in your spaceships. Suppose that Al is moving away from you at 85 km/hr. You throw a ball in his direction at a speed of 75 km/hr. According to Al, which of the following is going on?
A. He sees you moving toward him at 85 km/hr and the ball moving toward him at 75 km/hr.
B. He sees you moving away from him at 85 km/hr and the ball moving toward him at 10 km/hr.
C. He agrees that he is moving at 85 km/hr and the ball is moving at 75 km/hr while you are standing still.
D. He sees you moving away from him at 85 km/hr and the ball moving away from him at 10 km/hr.
Answer:D
You and Al are both floating freely in your spaceships. Suppose that Al is moving away from you at 85 km/hr. You throw a ball in his direction at a speed of 75 km/hr. According to Al, which of the following is going on?
A. He sees you moving toward him at 85 km/hr and the ball moving toward him at 75 km/hr. B. He sees you moving away from him at 85 km/hr and the ball moving toward him at 10 km/hr. C. He agrees that he is moving at 85 km/hr and the ball is moving at 75 km/hr while you are standing still. D. He sees you moving away from him at 85 km/hr and the ball moving away from him at 10 km/hr.