# Newton's 2nd problems?

For a skydiver falling at high speeds through air, air friction (air drag) is quite strong. The Force of Gravity on the skydiver is -800 Newtons (force of gravity is better known as the _____ of the skydiver, and is negative because the force is pointed -? direction-). Air drag exerts 200 N upward, what is the acceleration of the 80.0 kg skydiver?

A skydiver weighs 500 N, and has a mass of 50 kg. The skydiver jumps out of a plane, and falls through air. As the skydiver continues to fall and speed up, the air drag on them increases. After they've sped up to a certain speed, the force of air drag is 500 N upward on them.

What will now happen to the sky diver once the air drag equals their weight? (choose all applicable)

Their velocity will increase

They will no longer accelerate

They will still accelerate, but at less than "g"

They will maintain constant velocity from then on

They will stop in mid air

Their velocity will decrease

Their acceleration becomes zero

Relevance

1. Since gravity exerts -800 N and air exerts +200 N, the net force on the skydiver is -600 N. Applying the second law

f = m a

Force f is -600 (N), and mass m is 80 (kg). Solving for acceleration a:

-600 = 80 a

a = -7.5 m/sec^2

2. They will no longer accelerate; their acceleration becomes zero.

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• They will maintain constant velocity from then on

Their acceleration becomes zero

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