A ball is thrown vertically upwards with a velocity of `20 ms^(-1)` from the top of a multistorey building. The height of the point from where the ball is thrown is 25 m from the ground. How long will it be before the ball hits the ground (Take, `g=10 ms^(-2)`) ?

Explanation

To solve the problem step by step, we will break it down into two parts: the upward motion of the ball and the downward motion after it reaches its highest point.

### Step 1: Determine the time taken to reach the highest point
When the ball is thrown upwards, it will eventually come to a stop at its highest point before falling back down. We can use the first equation of motion:

\[ v = u + at \]

Where:
...