A simple pendilum with bob of mass m and length l is held in position at an angle `theta` with t he verticle. Find its speed when it passes the lowest position.

Explanation

To find the speed of the bob of a simple pendulum when it passes the lowest position, we can use the principle of conservation of energy. Here’s a step-by-step solution:

### Step 1: Understand the Initial and Final Positions
- The pendulum is initially held at an angle \( \theta \) with the vertical.
- At this position, the bob has gravitational potential energy and no kinetic energy (since it is at rest).
- When the bob reaches the lowest position, all the potential energy will have been converted into kinetic energy.

### Step 2: Calculate the Change in Height
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