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Mildred on Skates

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Mildred on Skates

Mildred, who has a mass of 75kg, puts on a pair of ice skates, and stands at one end of an ice rink. The coefficient of kinetic friction between her skates and the ice is
3
4
the coefficient of static friction. She holds one end of a rope, and her friend Gertrude gently pulls the other end of the rope until she starts moving. A force of 49 N is required to start her moving.

Gertrude continues to pull with this same force, until Mildred crashes into the wall at the other end of the rink, at a speed of 10
m
s
.

How long is the skating rink?

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Problem by malimil

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