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f=m*a

a=m/s^2

so a = 72m/s * 4 s = 288 m/s^2 since you are breaking that means you are de-accelerating making the naswer be -288m/s^2

f = m* a

substitute

f= 8500kg * -288m/s^2

f= -2448000 N or -2.448 x 10 ^ 6

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