In lab you used a force probe to infer the frictional force (and the coefficient of friction) while dragging a wooden box across a table. This question asks you to follow a similar line of reasoning to figure out the coefficient of friction:   Suppose you're pulling a 3.7 kg block at constant velocity, across a frictionless horizontal table, using a spring that has a spring constant k = 1.4 N/cm. At some point you hit a rough patch on the table, where it is no longer frictionless. At this point, you observe that the spring stretches by 5.9 cm as you continue to pull the block at constant velocity.   Compute the coefficient of friction between the block and the rough patch on the table.

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