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**A hot air balloon is rising upward with a constant speed of 2.50 m/s. When the balloon is 3.00 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?**

I tried to solve this question by using formula below:

[tex]h=v_0t+\frac{1}{2}at^2[/tex]

However, I am not sure what is the value of [tex]v_0[/tex]. Is it zero or 2.50 m/s?

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