Velocity and acceleration both remain positive. Velocity and acceleration both become negative. Velocity remains positive but acceleration becomes negative. Velocity becomes negative but acceleration remains positive.
I gave my students this multiple choice question: When a person parachutes from a plane, she travels at about 67 meters per second. When she pulls her cord and her chute opens, she slows to about 3 meters per second. If the velocity and acceleration are both considered positive before the chute opens, how do her velocity and acceleration change when the chute opens?

Only one answer is correct among these 4 choices:
- Velocity and acceleration both remain positive.
- Velocity and acceleration both become negative.
- Velocity remains positive but acceleration becomes negative.
- Velocity becomes negative but acceleration remains positive.

Could you tell me which one is correct?

Velocity remains positive but acceleration becomes negative.