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A 61 - kg ice skater coasts with no effort for 61 m until she stops. If the coefficient of kinetic friction between her skates and the ice is μk=0.10, how fast was she moving at the start of her coast?

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  1. vf^2=vi^2+2ad
    and a=force/mass=mu*mg/m=mu*g
    solve for vi

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