Formula: Horizontal Throw Angle of impact Horizontal velocity Vertical velocity
$$\varphi ~=~ \arctan\left( \frac{ v_{\text y} }{ v_{\text x} } \right)$$
$$\varphi ~=~ \arctan\left( \frac{ v_{\text y} }{ v_{\text x} } \right)$$
$$v_{\text x} ~=~ \frac{ v_{\text y} }{ \tan(\varphi) }$$
$$v_{\text y} ~=~ \tan(\varphi) \, v_{\text x}$$
Angle of impact
$$ \varphi $$ Unit $$ \mathrm{rad} $$
Angle between the velocity components in horizontal and vertical direction. At this angle, the body lands on the ground.
Horizontal velocity
$$ v_{\text x} $$ Unit $$ \frac{\mathrm m}{\mathrm s} $$
Current velocity of the body in the horizontal direction.
Vertical velocity
$$ v_{\text y} $$ Unit $$ \frac{\mathrm m}{\mathrm s} $$
Current velocity of the body in vertical direction.