A girl is standing on the top edge of an 18 m high building. She tosses a coin upwards with a speed of `7.0ms^(-1)`.How long does it take for the Coin to hit the ground ?How fast is the coin going just before it strikes the ground? (`g=10ms^(-2))`

Explanation

To solve the problem step by step, we will use the kinematic equations of motion.

### Given:
- Height of the building (s) = 18 m
- Initial velocity of the coin (u) = 7 m/s (upwards)
- Acceleration due to gravity (g) = 10 m/s² (downwards)

### Step 1: Determine the final velocity just before the coin strikes the ground.
...