1. The problem statement, all variables and given/known data 1. Rob throws a baseball upwards at 14.2 m/s. His friend, John, is sitting in a tree 4.5m above Rob. a. Calculate how long it will take to reach John. b. If John misses the ball as it moves upwards, how long will it take to reach John again. 2. Relevant equations Δd=V(Δt) + 1/2 (a)(Δt)^2 3. The attempt at a solution I have found the time using the quadratic equation for part a which is 0.36s, but I am stuck on part b. I do not understand how to do it. It seems like Δd is the same in both parts. How in hell do I find Δt for part b.