Acar travels 10 miles east in 30 minutes. what is its velocity in miles per hour?
a) 20 miles per hour east
b) 3 miles per minute east
c) 0.333 miles per hour east
d) + or - 20 miles per hour depending on direction

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,?