Compute all parts of given problem:

Problem: Suppose a rocket-propelled motorcycle is fired from rest horizontally across a canyon 1.30 km wide.

Part I: What minimum constant acceleration in the x-direction must be provided by the engines so the cycle crosses safely if the opposite side is 0.680 km lower than the starting point?

Part II: At what speed does the motorcycle land if it maintains this constant horizontal component of acceleration? Neglect air drag, but remember that gravity is still acting in the negative y-direction.

Please give a full detailed explanation of solution for above problem.