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**1. Homework Statement**

A projectile is fired with initial velocity Vo at an angle of 20° with the horizontal. Determine the required value of Vo if the projectile is to hit point b.

point b is 3 km away.

**2. Homework Equations**

y=(Vy)o t + 1/2 a t^2

**3. The Attempt at a Solution**

i tried isolating time(t) from the above formula which gave me square root of 2y/a but i cant take the square root of a negative number that bring the acceleration