how much work must be done by frictional forces in slowing a 1000-kg car from 26.1 m/s to rest?


  1. Answer:


    Work done by the frictional force is 3.41×10^5 J

    It is given that,

    Mass of the car, m = 1000 kg

    Initial velocity of car, u = 26.1 m/s

    Finally, it comes to rest, v = 0

    We have to find the work done by the frictional forces. Work done is equal to the change in kinetic energy as per work – energy theorem i.e.

    W = −340605 J

    or Hence, the correct option is (a).

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