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A manufacture of barriers for racing circuits is testing the impact absorption capabilities of its new product. A 1000 kg (mb) barrier of the new material is installed in a test room and the friction coefficient of the barrier with the floor is μb = 0.8. A 100 kg (ms) steel block (considered infinitely rigid in comparison with the barrier) is accelerated by a hydraulic system which applies a constant force Fh = 1 kN for a time t1 of 3 second before releasing the blocks. The steel block slides on the floor with a friction coefficient of μs = 0.1. After a rectilinear motion for a distance ?x2 = 2m (still on the same floor) the steel block hits the barrier. At the end of the test the engineers find that the barrier has moved by ?xb = 10 cm.
How much energy is lost in friction before the impact?
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