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At an international auto race, a race car leaves the pit after a refueling stop an accelerates.......?

• Information- At an international auto race, a race car leaves the pit after a refueling stop an accelerates uniformly to a speed of 75m/s in 9s to rejoin the race... Question A- What is the race car's acceleration during this time? Question B- What was the race car's average speed during the acceleration? Question C- How far does the race car go during the time it is accelerating? Question D- A second race car leaves after its pit stop an accelerates to 75m/s in 8 s. Compared to the first race car; what is this race car's acceleration; average speed during the acceleration; an distance traveled?

• Answer:

  A) by v = u + at =>75 = 0 + a x 9 =>a = 8.33 m/s^2 C) By s = ut + 1/2at^2 =>s = 0 x 9 + 1/2 x 8.33 x (9)^2 =>s = 337.50 m B) v(average) = s/t = 337.50/9 = 37.50 m/s D) you can do yourself as above