Correct answer only ! answer the following questions using the velocity and time graph above. a. at what time(s) was the car stopped? b. at what time(s) was the car maintaining a constant velocity? c. at what time(s) did the car accelerate? d. at what time(s) did the car have a negative velocity?

A).  Stopped . . . . . 0.7 to 0.8 hours (velocity is zero)

B).  Constant velocity . . . . . 0.2 to 0.4 hours, and 0.7 to 0.8 hours, and also 1.0 to 1.1 hours  (velocity doesn't change as time passes)

C-pos).  Positive acceleration . . . . . Zero to 0.2 hours, and 0.8 to 1.0 hours  (velocity gets bigger as time passes)

C-neg).  Negative acceleration . . . . . 0.4 to 0.7 hours  (velocity gets smaller as time passes)

D).  Negative velocity . . . . . Nowhere on this graph  (velocity less than zero)

magnets not strong enough

explanation:

friction

explanation:

they us to move forward and backwards