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physics

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A vehicle with a mass of 2 tons travels on a horizontal road at a speed of 126km/h.The driver notices a donkey at the side of the road and decides to reduce speed. The brakes are applied and the vehicle slows down to 72km/h after 5 seconds. Calculate the acceleration of the vehicle.

  • physics - ,

    First change the speeds to m/s.
    126 km/h = 35 m/s
    72 km/h = 20 m/s
    Speed change = 20 - 35 = -15 m/s
    Acceleration = (speed change)/(time)
    = -15/5 = -3.0 m/s^2

  • physics - ,

    How do you convert 126km/h to m/s

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