Solve the all given parts of following question:
Question: A motorcycle stunt rider rides horizontally off the edge of a vertical cliff of height 8.5 m and lands safely 12.3 m from the base of the cliff.
Part A: With what velocity did the motorcycle leave the cliff?
Part B: What was the direction of the motorcycles velocity just before hitting the ground?
Write your solution in appropriate format and provide references for above question.