Starting from rest, a block of mass m=5.0 kg slides down a frictionless ramp from point A to point C, then encounters a patch of surface of length L with coefficient of friction k=0.3 between points C and D as in Figure 4. Height h2=2.8 m and length L=5.1 m are as drawn, and the velocity at point C is vc=12.0 m/s. A. Calculate the velocity vb at point B. B. Calculate the height h1 at point A. C. Calculate the work done by friction between C and D. D. Calculate the velocity v at point D. E. How long would the friction patch need to be increased to in order to bring the object to rest

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