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eiko~ #_#
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The driver accelerates from a stop sign, cruises for 20s at a constant speed of 60km/h, and then brakes to come to a stop 40s after the stopsign. Compute the average acceleration for the following time intervals: a) t=0 to t=10s; b) t=30s... to t-40s; c) t=10s to t=30s; d) t=0 to t=40s.