Answer: It changes directions only
Explanation: When a baseball is thrown forward and bounces off the ground, the motion of the ball changes. Specifically, the ball changes direction.
Here's a step-by-step explanation of what happens:
1. Initially, the ball is moving forward due to the throw.
2. When the ball hits the ground, it experiences an upward force from the ground. This force causes the ball to change direction and start moving upwards.
3. As the ball moves upwards, it slows down due to the force of gravity pulling it downwards.
4. Eventually, the ball reaches its highest point and starts to fall back towards the ground.
5. As the ball descends, it accelerates due to the force of gravity pulling it downwards.
6. Finally, when the ball makes contact with the ground again, it experiences another upward force, causing it to change direction once more.
So, in summary, when a ball bounces off the ground, it changes direction. It does not speed up or stop moving, and it definitely does not stay in the same position.
I hope this explanation helps you understand the concept better! Let me know if you have any further questions.