A ball of mass 0.2kg moving at 30 m/s changes its velocity to 5 m/s , by the force of friction. Calculate the work done by the force of friction.
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The work done by the force of friction is W = mgh. The mass of the ball is 0.2kg and the initial velocity is 30 m/s. The final velocity is 5 m/s. The work done is W = (0.2kg)(5m/s)/(30m/s) = 0.06 J.
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