A small block moves at point A with a speed of 6 m/s. Its path is without friction until it reaches the section of length L=8.6 m where the coefficient of friction is 0.65. The indicated heights are h1 = 5.8m,h2 = 1.8 m. What is the speed of the block at point D? ( Take g = 10 m/s , write the answer with 2 decimal places only).
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