Let's now combine our rock tossing with a horizontal motion. This kind of problem can be handled by considering the vertical and horizontal motions separately. The horizontal velocity is constant. (Again, we ignore air resistance.) Recall from your study of trigonometry that if you release a rock at a speed $v$ in a direction that makes an angle $\alpha$ with the horizontal, then the initial vertical velocity $v_v$ and the horizontal velocity $v_h$ are given by $$v_v = v\sin\alpha \quad\hbox{and}\quad v_h = v\cos\alpha.$$
You shoot a rifle at an angle of 37 degrees. The bullet leaves your rifle at a height of 6 feet and a speed of 820 feet per second. It hits the ground after seconds at a distance of feet.
Note: Again, ignore air resistance. When shooting a rifle this is of course a gross simplification. Even so, that's some rifle!