Time and Velocity question

1. The problem statement, all variables and given/known data
A man using a hang glider who is descending at a speed of 8 m/s drops his cell phone from an altitude of 30 m.
a. How long does it take the cell phone to reach the ground?
b. What is the velocity of the cell phone just before it hits the ground?

2. Relevant equations
Vf^2=V0^2+2ay
t=v-v0/a

3. The attempt at a solution
(-8m/s)^2+2(-9.8 m/s)(-30)

I want to make sure I am using negative velocity and accel due to descending speed…

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