The position x of an experimental rocket moving along a long rail is measured to be x(t) = (4m/s)t + (7m/s2)t^2 + (5m/s3)t^3 – (0.35m/s4)t^4 over the first 10s of its motion, where t is in seconds and x is in meters. Find the velocity of the rocket for the first 10 seconds.   a. 43 m/s b. 224 m/s c. 244m/s d. 2240 m/s

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