When a stone is thrown upward, it follows a parabolic path given by a form of the

Question:

When a stone is thrown upward, it follows a parabolic path given by a form of the equation
y = ax2 + bx + c
If y = 0 represents ground level, find the equation of a stone that is thrown from ground level at x = 0 and lands on the ground 40 units away if the stone reaches a maximum height of 40 units? (Find the coordinates of the vertex of the parabola and two other points.)