A force F acts on a body such that it is always at an angle of `45^@` to the direction of motion. The body moves in a circle and covers a semicircle of radius R. What is the work done by the force F?

Explanation

To solve the problem, we need to calculate the work done by a force \( F \) acting at an angle of \( 45^\circ \) to the direction of motion of a body moving along a semicircular path of radius \( R \).

### Step-by-Step Solution:

1. **Identify the Path and Displacement**:
The body moves along a semicircle from point A to point B. The total distance covered along the semicircle is given by:
\[
S = \pi R
...