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**1. Homework Statement**

The U-2 was an American spy plane capable of flying up to 21 km high at speeds over 600km/h. Determine the time required for the missile to reach its maximum altitude of the U-2.

**2. Homework Equations**

d=v_i t+1/2 at^2

**3. The Attempt at a Solution**

d=21000m

a=-9.81m/s^2

v_i=0

t=?

I dont know how to get time by itself and I have tried using the quadratic formula.

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