A suitcase of mass M is placed on an airport conveyor belt, Fig. 2. The coefficient of static friction between belt and the suitcase is µe and the coefficient of kinetic friction is µc. The belt moves with a constant speed u and at t = 0 the suitcase is placed on the belt with velocity v = 0. (a) At t = 0, what is the force F⃗ acting on the suitcase? (b) How long does it take the suitcase to reach the conveyor speed v(t) = u? (c) What is the work done by the friction in this time? Did the friction give or take away energy in the process?

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