An object is launched from a known height at a known speed and a known angle abo

Question

An object is launched from a known height at a known speed and a known angle above the horizontal. Which single equation allows you to find the vertical component of its velocity vector just before it hits the ground?      

                            
           x = xo + vox t + 1/2 ax t2                             
           vx = vox + ax t                             
           vx2 = vox2 + 2 ax (x-xo)                             
           y = yo + voy t + 1/2 ay t2                             
           vy = voy + ay t                             
           vy2 = voy2 + 2 ay (y-yo)

An object is launched at a known speed and a known angle above the horizontal. Which single equation allows you to find the maximum height of its trajectory?                                        
           x = xo + vox t + 1/2 ax t2                             
           vx = vox + ax t                             
           vx2 = vox2 + 2 ax (x-xo)                             
           y = yo + voy t + 1/2 ay t2                             
           vy = voy + ay t                             
           vy2 = voy2 + 2 ay (y-yo)

An object is launched horizontally from a known height with a known speed. Which two equations will allow you to find its range (the horizontal distance at which it hits the ground.)                                        
           x = xo + vox t + 1/2 ax t2                             
           vx = vox + ax t                             
           vx2 = vox2 + 2 ax (x-xo)                             
           y = yo + voy t + 1/2 ay t2                             
           vy = voy + ay t                             
           vy2 = voy2 + 2 ay (y-yo)

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