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Old Dec 5th 2014, 05:56 PM   #1
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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.
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Old Dec 5th 2014, 08:04 PM   #2
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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).
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Old Dec 5th 2014, 08:09 PM   #3
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Say word.

Thanks for the speedy reply, friend
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