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A baseball player with mass m= 79 kg,sliding into second base, is retarded by a frictional force of magnitude 470 N.

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A baseball player with mass m= 79 kg,sliding into second base, is retarded by a frictional force of magnitude 470 N.What is the coefficient of kinetic friction µk between the player and the ground ?

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The free body diagram from the player is shown in the right. The force of friction is related to the normal force by f = µk N.

The vertical component of acceleration is zero,so the vertical component of Newton’s second law is

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