Question

1. how can the motion of an object that is already moving change? an object that is already moving can... write here...

Explanation:

According to Newton's first - law, an object in motion will stay in motion with a constant velocity unless acted upon by an unbalanced force. So, an already - moving object's motion can change when a net force acts on it. This can cause a change in speed (acceleration or deceleration) or a change in direction.

Answer:

change its speed or direction when a net force acts on it.