Answer
0.12
Work Step by Step
In part a we found that the force of friction was 0.132N. We know that the frictional force is the product of the Normal force and the coefficient of friction. To find the normal force we see that the puck is resting on a flat surface with its weight acting downward and the Normal force acting up. Therefore, N = mg = 0.11kg * 9.8 = 1.1 Newtons. Then since the total force was 0.132N and the Normal force was 1.1N then the coefficient is 0.12 since the coefficient * the Normal force must equal the force that slowed down the puck.
