Use the picture of a cart of mass m moving on a roller coaster as well as the accompanying information to answer the following question.The section of track displayed is frictionless and composed entirely of semicircular pieces of radius r.The letters A through E refer to specific locations along the track. if r=12 meters,and if the cart's velocity at point A is 3 meter per second,what is the cart's velocity at point D? Round off your answer to nearest tenth of a meter per second.
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