How to find a function of two variables?

Task. The target is at a distance a (const) from a soldier. At a distance h from the ground. A soldier throws a grenade in it at a certain angle alpha. Need to find a function of two variables F(alpha,h)=? July 4th 19 at 22:58
July 4th 19 at 23:00
Solution
Everything is simple. Need to find power with which to throw the projectile.
The projectile flies in a parabola, what is the sum of the movement along the axis X and Y. the X axis is the uniform rectilinear motion, the Y axis uniformly accelerated rectilinear. Accordingly, the coefficient for each axis computed using the sine and cosine of this angle.

Then you need write the equations of the coordinates for each of the axes through time. To make the equality of (motion the same) and solve the quadratic equation in General form.
Get a function of velocity.

Well, continue to show strength through speed. The task of the 8-9 class.

But for the last step do not have enough mass of the projectile.
And the drawing speed is specified, but not specified in the condition. So the problem is formulated is not correct.

If given initial velocity, the problem reduces to finding the mass of the projectile.
If you set the initial speed of the mass that does not depend. The rest - right. - Cody_Padberg8 commented on July 4th 19 at 23:03

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