Two stones are initially separated by a vertical distance y $($in meters$)$ from each other. One stone is thrown downward with ainitial velocity of $-17$ m$/$s and the other is thrown upward from the ground with an initial velocity

of $41$ m$/$s at the same time the other is thrown. how far in meters must the stones be separated so that theg will hit the ground at the same time? what is the impact velocity in m$/$s of the first and second stones?