Answer:
D. The object's speed, direction, or both can change.
Step-by-step explanation:
If Adam applies an unbalanced force to an object, the object's speed, direction, or both can change. This is because an unbalanced force causes an acceleration, which can result in changes in both speed and direction.
Let's consider some examples to better understand this concept. Imagine Adam pushes a book on a table with a greater force in one direction. If the force is greater than the friction between the book and the table, the book will start moving in the direction of the force. This change in direction is caused by the unbalanced force applied by Adam.
Now, let's say Adam applies a constant force to a ball on the ground. If the force is greater than the friction between the ball and the ground, the ball will start rolling and its speed will increase. Again, this change in speed is due to the unbalanced force applied by Adam.
In summary, when an unbalanced force is applied to an object, it can cause changes in the object's speed, direction, or both. So, the correct answer is D: The object's speed, direction, or both can change.