What must be the coefficient of static friction

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Q1. What is the acceleration in m/s of a 0.001kg bullet if the force of recoil gives an acceleration of 4.390 m/s? The gun has mass of 0.20 kg.

Q2. You have a mass of 57 kg and are on a 54 degree slope hanging on to a cord with a breaking strength of 157 Newton's. What must be the coefficient of static friction to 2 decimal places between you and surface for you to be saved from the fire?

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