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a weightlifter raises a 200-kg barbell with an acceleration of 3 m/s. How much force does the weightlifter use to raise the barb?

  • science - ,

    To maintain the weight at the same place, the force required is mg.
    To accelerate upwards at acceleration a=3m/s², he/she must apply an additional force of ma.
    So the total force is
    m(g+a) N
    where
    m=mass of weight
    g=acceleration due to gravity
    a=acceleration upwards.

  • science - ,

    400kg

  • science - ,

    A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is

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