18. In an airplane flying at a constant speed, the
force pushing the airplane forward is exerted
by the engine and is equal to the opposite
force of air resistance. Describe how these
forces compare when the plane speeds up
and slows down. In which direction is the
net force on the airplane in each case?
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Ответ:
The statement is false because the sky can change colors during sunsets, sun rises, etc. The sky is not always blue.