To determine the motion of the animal, we can analyze the forces acting on it:
- **Applied force** to the right: 25 N
- **Frictional force** to the left: 18 N
- **Force of gravity** downwards: 65 N
- **Normal force** (ground pushing up): 65 N
Now we can break it down into two dimensions:
1. **Horizontal (left-right) forces**:
- Net force = Applied force (right) - Frictional force (left)
- Net force = 25 N (right) - 18 N (left) = 7 N (right)
2. **Vertical (up-down) forces**:
- Net force = Normal force (up) - Force of gravity (down)
- Net force = 65 N (up) - 65 N (down) = 0 N (there is no net vertical force)
Since there is a net force of 7 N to the right and no net vertical force, the animal will move to the right due to this unbalanced force.
Therefore, the best description of the motion of the animal is:
**b. The animal will move to the right due to an unbalanced force on the right.**