Yanni is sitting in the stands watching a football game. The quarterback runs forward toward the end zone and throws a pass straight downfield to a player for a touchdown. The quarterback ran at a speed of 8 m/s and threw the ball with a speed of 15 m/s.

The 15 m/s throwing speed is measured relative to the quarterback. Because the quarterback and ball are moving in the same direction, Yanni sees the ball moving at 8 + 15 = 23 m/s. So the ball’s speed is 23 m/s for Yanni and 15 m/s for the quarterback, as choice A states.

AI-written and checked against the verified answer.