Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Explanation

To derive the expression for the work done when a force is acting on an object in the direction of its displacement, follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Work Done**:
Work done is defined as the product of the force applied on an object and the displacement of that object in the direction of the force.

2. **Identify the Variables**:
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