Final answer:
The question regarding maximum airspeed for landing gear operations cannot be answered without specific flight manual details of the aircraft involved, as maximum airspeed limits vary between different airplane models.
Step-by-step explanation:
The question is asking for the maximum airspeed at which the landing gear of an airplane can be safely retracted or extended. This is a specific operational detail that varies among different aircraft and would be specified in the aircraft's flight manual, but it is not directly related to the kinetic energy scenario provided in the reference information. The information given in the references—regarding the kinetic energy of an airplane during landing, a baggage tractor pulling luggage carts, and an aircraft being pushed by a tractor—does not directly provide an answer to the initial question about landing gear airspeed limits. Therefore, without specific details on the aircraft model and its operational limitations, one cannot confidently provide the correct answer to this multiple-choice question.