Eight rain drops of radius `1mm` each falling downwards with a terminal velocity of `5 cm c^(-1)` coalesce to form a bigger drop. Find the terminal velocity of bigger drop.

Explanation

To solve the problem of finding the terminal velocity of the bigger drop formed by the coalescence of eight smaller raindrops, we will follow these steps:

### Step 1: Calculate the Volume of the Smaller Drops
The volume \( V \) of a single raindrop (which is spherical) can be calculated using the formula:
\[ V = \frac{4}{3} \pi r^3 \]
where \( r \) is the radius of the smaller drop.
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