A block of mass M is pulled along a horizontal surface by applying a force at angle `theta` with the horizontal. The friction coefficient between the block and the surfasce is `mu`. If the block travels at a uniform velocity, find the work donen by this applied force during a displacement d of the blcok.

Explanation

To find the work done by the applied force when a block of mass \( M \) is pulled along a horizontal surface at an angle \( \theta \) with the horizontal, we can follow these steps:

### Step 1: Identify the Forces Acting on the Block
The forces acting on the block include:
- The weight of the block \( W = Mg \) acting downwards.
- The normal force \( N \) acting upwards.
- The applied force \( F \) at an angle \( \theta \) with the horizontal.
- The frictional force \( f \) acting opposite to the direction of motion.
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