A ladder of mass 20 kg is resting against a vertical smooth wall. Ladder makes an angle 37° with the wall. Other end of the ladder is resting on a rough horizontal floor. Find normal force and force of friction applied on the ladder by horizontal surface.

Explanation

To solve the problem of finding the normal force and force of friction applied on the ladder by the horizontal surface, we will follow these steps:

### Step 1: Identify the forces acting on the ladder
1. **Weight of the ladder (W)**: This acts downwards at the center of the ladder (point C). The weight can be calculated as:
\[ W = mg = 20 \, \text{kg} \times 10 \, \text{m/s}^2 = 200 \, \text{N} \]
2. **Normal force from the wall (N)**: This acts horizontally towards the ladder from the smooth wall.
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