If you have quadratic function (parabola) f(x)=ax^2+bx+c where a<0 (as in your case) its maximum value will be -(b^2-4ac)/(4a) (that is the height of vertex of parabola), and that maximum...

Latest answer posted May 14, 2013 11:19 am UTC

We are given the initial speed of the coin and the time it took before it hit the water. The given initial speed is the horizontal speed -- that is, the horizontal component of the initial speed....

Latest answer posted August 26, 2013 8:14 am UTC