Pedro throws a ball upward at a rate of 20 meters per second from an initial height of 2 meters. The height of the ball above the ground can be approximated by h = -5t^2 + 20 + 2 ...where t represents the amount of time, in seconds, since the ball has been released.

I have absolutely no idea how to solve this, can someone help me step by step on how to solve this? Thanks!