simple physics

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A 1500 kg car travels along the road at 25 m/s when the driver sees the light turn red and applies the brakes. What average force is needed to stop the car in a) 5 seconds and b) .2 seconds?
What formula should be used?

  • simple physics -

    Force*Time = Initial momentum = 1500*25 kg m/s

    Divide 3.75*10^4 by the time interval to get the force, which will be in Newtons.

  • simple physics -

    1500*25=60^2=120

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