How long will a stone take to fall to the ground from the top of a building 80 m high and What will be the velocity of the stone on reaching the ground? (Take `g=10 "m s"^(-2)`)

Explanation

To solve the problem of how long a stone will take to fall from the top of a building that is 80 meters high and what its velocity will be upon reaching the ground, we can follow these steps:

### Step 1: Identify the known values
- Height of the building (h) = 80 m
- Initial velocity (u) = 0 m/s (since the stone is dropped)
- Acceleration due to gravity (g) = 10 m/s²

### Step 2: Use the second equation of motion to find the time taken (t)
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