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14 October, 13:56

A hockey puck of mass 0.16 kg is slapped so that its velocity is 50 m/sec. It slides 40 meters across the ice before coming to rest. How much work is done by friction on the puck?

A. + 4 J

B. - 60 J

C. - 200 J

D. - 340 J

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Answers (1)
  1. 14 October, 14:12
    0
    The puck stopped so work done by friction is the same as the initial kinetic energy, 1/2*mass*velocity^2.

    1/2*0.16*50^2=200J. The answer is C.

    (Thx Steve)
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