A block with a mass of m = 2500 grams slides towards a spring with a spring constant k = 320 N/m. When the block stops, the block is able to compress the spring as far as 7.5 cm. The coefficient of kinetic friction between the beam and the floor is 0.25. (a) How much work is done by the block from the moment it contacts the spring until it presses the spring until it stops, (b) How much heat energy increases in the floor-beam system, (c) what is the speed of the block right when it contacts the spring?

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