For this case we must use the projectile equation for this problem. We have then: h (t) = - 16t ^ 2 + Vt + h Where, V: initial speed h: height For the tennis ball we have: h (t) = - 16t ^ 2 + 130t + 2 Answer: An equation that correctly models the ball's height as a function of time is: h (t) = - 16t ^ 2 + 130t + 2