A man standing on the roof a house of height `h` throws one particle vertically downwards and another particle horizontally with same velocity `u`. Find the ratio of their velocities when they reach the earth's surface.

Explanation

To solve the problem, we need to analyze the motion of both particles separately and then find their velocities when they reach the earth's surface.

### Step 1: Analyze the first particle (thrown vertically downwards)
- The first particle is thrown vertically downwards with an initial velocity \( u \).
- The height from which it is thrown is \( h \).
- We can use the kinematic equation to find the final velocity \( V_1 \) of the first particle when it reaches the ground:

\[
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