- #1

kvan

- 9

- 0

## Homework Statement

An artillery gun is trying to hit a target that is 12.5 km away. If the shell is fired at 650 ms-1 at what angle above the horizontal should the gun be fired to hit the target assuming that air resistance is negligible? [g=9.8 ms-2]

## Homework Equations

I tried using [tex] v^2_y = v^2_0_y + 2gt [/tex] and [tex] v_x = \frac{d_x}{t} [/tex]

## The Attempt at a Solution

I tried breaking the 650m/s into component vectors for x and y. I used the y component to try and find time it took to reach maximum height, then doubled this value to find total time. I used this value for time and plugged it into v=d/t in an attempt to maybe create an equation where I could find the angle for the cannon.

I got stuck at that point and I don't really know what to do. Any suggestions?