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## Homework Statement

Find the muzzle speed of a gun whose maximum range is 24.5 km.

## Homework Equations

R = V

_{0}

^{2}sin2angle/g

## The Attempt at a Solution

How do I find the angle?

Also can you check what I did wrong in this one?

A projectile is fired at a speed of 840 /sec at an angle of 60 degree. How long will it take to get 21 km downrange?

change in X = V

_{1}t

21,000/840 = t

t=25 sec

But the right answer is 50 s