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9. Consider a Boeing 747 Aircraft. It has a mass of about 105 kg. A typical long-haul aircraft cruises at an altitude of approximately 40,000ft, which is roughly 12,000m in SI units. A 747 can cruise at roughly 550 mi/hr, which is about 250 m/s. What is the kinetic energy of a cruising, fully-loaded 747 Aircraft? 10. Consider a Boeing 747 Aircraft. It has a mass of about 105 kg. A typical long-haul aircraft cruises at an altitude of approximately 40,000ft, which is roughly 12,000m in SI units. A 747 can cruise at roughly 550 mi/hr, which is about 250 m/s. What is the potential energy of a cruising, fully-loaded 747 Aircraft? 11. Consider a Boeing 747 Aircraft. It has a mass of about 105 kg. A typical long-haul aircraft cruises at an altitude of approximately 40,000ft, which is roughly 12,000m in SI units. A 747 can cruise at roughly 550 mi/hr, which is about 250 m/s. In order to cruise, a 747 must typically exert a force of 200,000N or so with its engines. For what distance journey is the work done by the engine while cruising approximately equal to the potential energy of the aircraft at a cruising altitude of 12,000m?