Hey all, Having trouble solving this one. Class is dynamics. 2D, constant accel. Shooting a cannon at a point above the initial. Inital velocity is 400m/s Cannon is at point A (origin) and we're shooting at point B @ (5000m, 1500m) I'm asked to find the two thetas that satisfy. So i got this so far, basicly the givens. In the x: ax = 0 vx = v0*cos(Θ) x = v0*cos(Θ)*t In the y: ay = -g vy = v0*sin(Θ)-gt y = v0*sin(Θ)*t-(1/2)gt2 I tried to eliminate t is the y position equation by 1) solving x for t 2) subing into y(Θ,t) for t to get y(Θ) 3) solving for Θ I cant get through solving for Θ. Can I use the quadradic equation on y(Θ) to solve for Θ? How do i do that?