When moving on level ground, cross-country skiers slide their skis along the snow surface to stay moving.

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When moving on level ground, cross-country skiers slide their skis along the snow surface to stay moving. The coefficients of friction for a given set of skis and given snow conditions can be modified by various types of waxes. In order to move across the snow as fast as possible,

(a) should you choose a wax that makes the coefficient of static friction between skis and snow as high as possible or as low as possible?

(b) Should you choose a wax that makes the coefficient of kinetic friction between these two surfaces as high as possible or as low as possible?

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