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OpenStudy (anonymous):
A cart has a constant acceleration of a = 2m/s^2. At a certain instant its speed is 5m/s. what is its speed 2 s later and 2 s earlier? What is its average speed during the time interval of 4 s?
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OpenStudy (anonymous):
v = u + at 9m/s - later 1m/s - earlier avg speed 4s (9-1)/4 = 2m/s
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