8.
objects tend to "keep on doing what they're doing" (unless acted upon by an unbalanced force). when your car abruptly stops, the seat belt provides the that brings you from a state of motion to a state of rest.

a. spring force
b. unbalanced force
c. friction force
d. gravity force

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?