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Posted by on Friday, January 4, 2013 at 7:25pm.

A car of mass 400kg moving initial at 36km/h increases to 120km/h in 6sec, what is the force acting on the car?

  • Mechanics - physics - , Saturday, January 5, 2013 at 2:17am

    Force = Mass x Acceleration

    For the force to be in Newtons, the Mass must be in kg (400 kg in this case), and the acceleration must be measured in m/s^2.

    In your case, acceleration is
    (84 km/h *1000 m/km)*)(1h/3600 s)/6 s
    = 3.889 m/s^2

    F = 400 kg*3.889 m/s^2 = 1556 N

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