Velocity/displacement/time problem

[xotash]

1. Homework Statement

A person on an apartment balcony holds a ball over the balcony and throws it directly upwards with an initial velocity of 30 m/s [up]. The ball was thrown from 15 m above the ground. How long will it take for the ball to hit the ground?

Homework Equations

The Attempt at a Solution

The givens I have here so far I think is:
V1 = 30 m/s [up]
V2 = 0 m/s
∇d = 15 m

 

[ap123]

Why do you think v2=0?
You don't need this anyway.

Draw your y-axis and choose a location for the origin, and then write down the information you are given taking care with the signs.

Then you can just choose the most appropriate suvat equation.