On an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/s

Question

On an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/s encounters a rough patch that reduces her speed by 50 % due to a friction force that is 28 % of her weight.

Question 9 Part A On an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/s encounters a rough patch that reduces her speed by 50 % due to a friction force that is 28 % of her weight. Use the work-energy theorem to find the length of this rough patch Express your answer using two significant figures 13.3 in Submit My Answers Give Up Incorrect, Try Again; 4 attempts remaining

Explanation / Answer

friction force = 0.28mg

work done by friction = change in KE

- f.d = KEf - KEi = m ( 3^2/2 - 6^2/2)

- 0.28mgd = -13.5m

d = (13.5)) / (0.28 x 9.81)

d = 4.91 m

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