Physics

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A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?

  • Physics -

    force= mass*acceleration

    What is acceleration?
    vf^2=Vi^2+2ad solve for a.

  • Physics -

    first:-
    X=X1+0.5(Vx+V1x)t
    140=0+0.5(20)t
    t=14s
    second:-
    a=v/t=20/14=1.43m/s2
    F=m*a=1000*1.43=1430N to the south

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