I must be missing something because I keep finding that this cannon ball falls short. Anyway, the question is at what angle does a cannon have to fire for the cannon ball to hit the ground 269 ft away if the initial velocity of the ball is 100ft/s? I set up 2 equations like so.
100tcos(x)=269
100sin(x)-32.2t=0
t is the time and x is the angle, someone let me know that my brain just isn’t working today
Apparently my brain wasn’t working properly either becuase it took me a while to get the right answer. Your mistake is that your 1st equation is solving for the final position of the ball while your 2nd is solving for a point of 0 velocity i.e. the apex of the trajectory. Instead of 269 in your first equation put 269/2 and you should get the right answer.
t=1.55s x=.52375 radians or 30 degrees.
Bah I see you got it on preview damn me for taking too long. I am posting it anyhow.
The second equations says that in the absence of gravity the vertical distance of the ball will be along the straight line v[sub]o[/sub]tsin(a). Gravity makes it fall below that distance by gt[sup]2[/sup]/2.