Devon is applying 100N of force to pull a 15 kg object, but the object isn't moving. What does this indicate about the coefficient of
friction for the surface?

Coefficient of friction is at least 0.68

Explanation:

The maximum possible friction, is given by where is coefficient of friction and R=mg where m is mass and g is acceleration due to gravity. For the object to move, the applied force must be greater than the frictional force hence for this case

Therefore, it means the coefficient of friction is at least 0.68

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the answer is 46 mls because when you add the speed per second it increses the speed