Velocity and acceleration problem!?

Question

Stephanie serves a volleyball from a height of 0.79 meters and gives it an initial velocity of +6.7 meters per second straight up. How high will the volleyball go??

Answer 1

v = at
Time to reach apex:
t = v/a = 6.7/9.8 = 0.68367sec
s = (1/2)at^2
s = (1/2)(9.8)(0.68367)^2
s = 2.29m
h(max) = 2.29 + 0.79 = 3.08m