The speed and direction of the object will change. The speed and direction of the object will not change. The direction of the object will change; the speed will remain constant. The speed of the object will change; the direction will remain constant.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: An object is moving in a straight line at a constant speed. What will happen to the object if no outside force acts on the object?
Possibilities:
- The speed and direction of the object will change.
- The speed and direction of the object will not change.
- The direction of the object will change; the speed will remain constant.
- The speed of the object will change; the direction will remain constant.

The speed and direction of the object will not change.