The first one is It takes 40sec for a car at rest to reach a velocity of 50 m/s. What is the car's initial velocity? a. 0 m/s b. 1.25 m/s c. 1.25 m/s2 d. 50 m/s e. 50 m/s2 I think the equation is a=v(final)-v(intial)/t but it can't be because doesn't a(acceleration)= m/s2? so there for you don't have the number acceleration to plug in?? Also I think I think v(final) is 50 m/s... and I don't knbow but if something is at rest then wouldn't that be v(intial)?? Please help!!!! I am so confused! OMG I really need to know this for a upcoming test The next one is. It takes 40sec for a car at rest to reach a velocity of 50 m/s. What is the car's acceleration? I know the answer for this one but what is confusing me is that I have to choices for this answer and they are A. 1.25 m/s B. 1.25 m/s2 could you explain to me which one is right and how did you come to get that this is how I solved this problem I used a=v(final)-v(initial)/t(time) The v(final) is 50m/s and the v(initial) is 0 because the car started at rest. and the t is 40 (because its in seconds I subtracted 50-0 then divded it by 40. Last but not least: A car starts from rest has a constant acceleration of 4m/s2. In the first 3s the car travels a. 6m b. 12m c. 18m d. 172m I really do not understand this one. Do you use the acceleration formula. PLEASE HELP!! I went to tutoring at my university and they didn't know how to do them either! So help me smart people lol. Thank you in advance!