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A car with a mass of 1,200 kg experiences a breaking force of 720 N. What acceleration does the car experience? If the car was travelling at 20 m/s when the braking force started, how long will it take for the car to come to rest?

Respuesta :

Answer:

See below

Explanation:

You probably know

F = ma    then

  a = F/m   = 720/ 1200 = .6 m/s^2    

              since it is a BRAKING force , the acceleration will be negative

                      = - .6 m/s^2

vf = 0  

    vf = vo + at

                0 = 20 + (-.6)t     shows t =  33 1/3 seconds

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