HELP PLZ FOR A TEST!! A position-time graph is shown below: (2 points)

-Which statement accurately describes the motion of the object in the graph above over 10 seconds?
-The object moves forward at 1 cm/s, stops, and then continues at the same velocity.
-The object moves forward at 1 cm/s, stops, and then increases velocity to 2 cm/s.
The object is at rest for 4 seconds and then moves forward for 4 seconds at 1 cm/s.
-The object is at rest for 3 seconds and then decreases velocity to 1 cm/s for 3 seconds.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?