You are at a red light in your car. the red light turns green, and you take your foot off the brake and step on the gas pedal, without turning the steering wheel. the speedometer changes from to in seconds. in those seconds, did the car change velocity? is that an acceleration

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,?