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4. A 35.0 N cat stands on a spring scale in an airplane.  If the scale reads 32.5 N, the airplane is
A. climbing at a constant rate. The total force of the cat on the scale is the acceleration of gravity plus the vertical component of the acceleration of the airplane.

Since the scale reads less than the value on the ground, the cat must be accelerating toward the ground.

The Correct Answer is D.

B. climbing while accelerating
C. diving at a constant rate
D. diving while accelerating