Final answer:
The physics problem involves calculating the time required for an airplane to reach a certain speed and altitude given the power output of the engines; determining the actual power if the time is longer due to air resistance; and finally, calculating the average force of air resistance based on power and time.
Step-by-step explanation:
The specifically involving calculations of how long it would take for an airplane to reach a certain speed and altitude, given a certain power output of its engines, and considering factors such as air resistance. In part (a), the time required for an airplane with a mass of 1.50×105 kg and engine power of 100 MW to reach 250 m/s and an altitude of 12.0 km with no air resistance would be calculated using formulas involving kinetic energy and potential energy.
In part (b), if the time taken is 900 seconds, the actual power can be found using the work-energy principle. While in part (c), with the actual power calculated and a time of 1200 seconds, the average force of air resistance can be determined using the power, the distance traveled, and the work done against air resistance.