Air resistance is a nonconservative force. it always opposes the motion of an object. an airplane flies from new york to atlanta and then returns to its point of departure. the net work done by air resistance during this round trip

a) is negative for slower speeds and positive for higher speeds

b) is positive

c) is negative

d)is zero

e) is negative for higher speeds and positive for slower speeds

c) is negative

Explanation:

As we know that work done by a force is the product of force and displacement vector.

W= F.d

F= Force

d= displacement

The work done by friction force always negative because it try to oppose the motion and act opposite to the direction of displacement.So the work done by air resistance is negative.

c) is negative

b.

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kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.