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Question:

A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor.

1. What is the coefficient of static friction between the box and the floor?
2. If the 35.0-N force continues, the box accelerates at $0.60 \textrm{ m/s}^2$. What is the coefficient of kinetic friction?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

1. $0.60$
2. $0.53$