Which of the following is the most accurate description of the relationship between velocity and acceleration? Velocity and acceleration are the same thing.

Velocity is a type of acceleration.

Acceleration is a change in velocity.

Acceleration is positive and velocity is negative.

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve