Question

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

Answer 1

-200 J

Step-by-step explanation:

;0

Answer 2

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)