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Given $2$ points, $A$ and $B$, if I am in $A$ and I have an inclination angle $c$, with how many velocity do I need to shoot a projectile to hit $B$ ? My problem is, how do I setup this data in an equation so that I can solve it with a program?

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  • $\begingroup$ Strength is an elusive concept. Do you actually mean velocity? Then it would be independent of mass. If you mean force, one would need to know how long the force was applied. $\endgroup$ Nov 22, 2012 at 2:21
  • $\begingroup$ Thanks,it´s edited. Let´s work with the velocity to eliminate m. How can I work with this variables? $\endgroup$
    – chubakueno
    Nov 22, 2012 at 2:27

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Let $A$ be the origin and $B$ be $(x,y)$. The angle of projecting is $c$. The parabolic trajectory is given by the formula below $$y = x \tan(c) - \dfrac{g}{2u^2 \cos^2(c)}x^2$$ enter image description here This gives us $$u^2 = \dfrac{gx^2}{2 \cos^2(c) (y-x \tan(c))}$$ Hence the unique velocity is $$u = \left \vert \dfrac{x}{\cos(c)} \right \vert \sqrt{\dfrac{g}{2(y-x \tan(c))}}$$

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