An 1865-kg airplane starts at rest on an airport runway at sea level. What is the change in mechanical energy of the airplane if it climbs to a cruising altitude of 2320 m and maintains a constant speed of 97.5 m/s? = 51.3 MJ Submit Correct My Answers Give Up Part B What cruising speed would the plane need at this altitude if its increase in kinetic energy is to be equal to its increase in potential energy? 1 v=21324 ? m/s