Physics Help Forum Seeking help with projectile kinematics.

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Dec 5th 2014, 04:56 PM #1 Junior Member   Join Date: Dec 2014 Posts: 2 Seeking help with projectile kinematics. Hello all! I'm new here. I have a sort of dilemma; say you're given point A {x1,y1} and point B {x2,y2} and the acceleration down due to gravity, how do you first compute the angle a projectile should be launched at and then the force at which to launch it to get it from A to B? (I suppose more so than force I am looking for initial speed) I'm not the physics junkie I once was (this is for a personal programming assignment,) so pardon me if this is a rather juvenile question lol. I have how I believe the problem is solved implemented, but I'm not sure it's right.
 Dec 5th 2014, 07:04 PM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,331 You can start by selecting whatever value of horizontal velocity component you want - let's call it v_x, and from that calculate the time of flight from t=(x2-x1)/v_x. Then for the initial vertical velocity component use: y2=y1+v_yt-(1/2)gt^2 and solve for v_y. Now you have the horizontal and vertical components of initial velocity, and can use pythagorus to determine total initial velocity: V=sqrt(v_x^2+v_y^2) The initial launch angle is equal to arctan(v_y/x_x).
 Dec 5th 2014, 07:09 PM #3 Junior Member   Join Date: Dec 2014 Posts: 2 Say word. Thanks for the speedy reply, friend

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