# Chapter 4 - Conceptual Questions - Page 145: 9

The force of gravity pulls down on the parachutist while a drag force from the parachute pulls upward on the parachutist. When these two forces have the same magnitude, the parachutist falls at a constant velocity. Since the net force is zero, the acceleration is zero.

#### Work Step by Step

There are two vertical forces acting on the parachutist. The force of gravity pulls down on the parachutist while a drag force from the parachute pulls upward on the parachutist. When these two forces have the same magnitude, the parachutist falls at a constant velocity. Since the net force is zero, the acceleration is zero.

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