A boy is running along positive x - axis with `9 m//s`. While running he manages to throw a stone in a plane perpendicular to his direction of running with velocity `12 m//s` at an angle `30^@` with vertical. Find the speed of the stone at the highest point of the trajectory.

Explanation

To solve the problem, we need to find the speed of the stone at the highest point of its trajectory. Let's break it down step by step.

### Step 1: Identify the components of the stone's velocity
The stone is thrown with a velocity of 12 m/s at an angle of 30 degrees with the vertical. We need to find the horizontal and vertical components of this velocity.

- The vertical component (Vy) can be calculated using:
\[
V_y = V \cdot \cos(\theta)
...