What is the acceleration of an airplane maintaining a constant speed of 67.7 m/s?

Zero

Explanation:

The acceleration of the plane is given by:

where

is the change in velocity

is the time taken

In this problem, we are told that the airplane is traveling at constant speed, so (assuming it is traveling in a straight line*), its velocity is not changing. Therefore, and the acceleration is zero.

*if the airplane is changing direction, then its velocity is changing (because velocity is a vector), so the acceleration in this case would not be zero.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.

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