Consider the following 4 cases of motion of the same mass under a constant downward gravitational acceleration g = 9.8 m/s 2 . a b c h θ α d d o b a c v v v vo v v in cases a & b the mass is released from rest. in cases c & d the initial speeds are v0. in all 4 cases the mass fell the same distance h. calculate the final speed va of the mass.