A tennis ball is thrown up and reaches a height of 4.05 m before coming down. What was its initial velocity? How much total time will it take to come down? Assume `g=10m//s^(2)`

Explanation

To solve the problem of finding the initial velocity of a tennis ball thrown upwards to a height of 4.05 m and the total time it takes to come back down, we will use the equations of motion under uniform acceleration due to gravity.

### Step-by-Step Solution:

1. **Identify the known values:**
- Maximum height (h) = 4.05 m
- Acceleration due to gravity (g) = 10 m/s² (acting downwards)

...