physics =)

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A race car has a mass of 710 kg. It starts from rest and travels 40.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?

  • physics =) -

    First calculate the acceleration from the distance and time using the formula:
    S=v0t+(1/2)at²
    where
    a=acceleration
    S=distance
    v0=initial velocity
    t=time
    a=2(S-v0t)/t² (assumed uniform)

    Find force F from
    F=ma

  • physics =) -

    Thanks a lot! I got F = 6311.11 N.

  • physics :) -

    The answer is correct!
    Have a merry Christmas, and enjoy your holidays!

  • physics =) -

    F*X = KE increase = (1/2) M Vfinal^2
    Vfinal = 2*Vaverage = 2*X/T =2*(40/3) = 26.67 m/s
    F = (1/2)*(710)*(26.67)^2/40 = 6313 N

    We agree

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