What is the maximum height the rock will reach?

Answer:
Explanation:
initial vertical velocity = 17.5 m/s
using g=-9.81 m/s^2
apply kinematics equation
v1^2-v0^2=2gS
solve for S with v1=0, v0=+17.5
S = (v1^2-v0^2)/2g
=(0-17.5^2)/(2*(-9.81))
= 15.61 m