A car stops in 120 m. If it has an acceleration of –5m/s 2 , how long did it take to stop

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

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,?

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two