1. A box is being pulled up a 40° incline by a 7.0 kg block suspended from a frictionless, massless pulley. Thebox does not start at the very bottom of the incline. The block is suspended 2.0 m above the ground. Thecoefficient of kinetic friction between the box and the incline is 0.40. The block is released from rest. At themoment the block hits the ground, the box is traveling at 2.0 m/s up the incline. What is the mass of thebox?

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