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## Homework Statement

A sled is pulled over a horizontal surface where the kinetic coefficient of friction is .20. What is the minimum force necessary to keep the sled moving if its mass is 2 slugs?

## Homework Equations

fs = Ns(mg)

## The Attempt at a Solution

fs = (.20) (2 slugs) (32)

=12.8

This problem has got me stumped. Please help! Thank You.