Final answer:
The strength of the airplane's thrust is d) 2100 N.
Step-by-step explanation:
The strength of the airplane's thrust is d) 2100 N. The question is asking for the strength of the airplane's thrust. From the information given, we can calculate thrust using physics concepts related to forces and motion. However, there is not enough information in the question to directly determine the strength of the thrust. We would need additional data such as the mass of the airplane and the acceleration to calculate thrust using Newton's Second Law of Motion. In physics problems like these, we use free-body diagrams to represent forces acting on an object and equations to solve for unknown variables.