Football question (kinematics)

[hotshot1kille]

Homework Statement

A foot ball is kicked from a height of 2.0 m to a maximum height of 8.0m. Calculate the football's initial velocity and the time taken to reach the maximum height.

Homework Equations

The Attempt at a Solution

I could solve it if i was given time, acceleration or vf or v i but only two variables are given and that too of the same. Can someone help me. I could assume vi is 0, but i have no idea how to approach this

 

[LeSage]

If this is a one-dimensional free-fall problem , then this is how you solve it:

Your Δx is 6
Final velocity is given to you: Since it says maximum height, at that height your final velocity will be 0.
Most importantly, your acceleration will be -9.8 m/s^2 since once the football is in the air, gravity is the only force acting on it.

With those given data, just go to your big four, and voila! :)

 

[hotshot1kille]

Ahh i see, yea now it makes sense. Thanks a lot!