Posted by **Dennis** on Wednesday, August 29, 2012 at 3:08pm.

A sprinter explodes out of the starting block with an acceleration of +4.1 m/s2, which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race.

(a) What is her velocity at t = 1.2 s.

(b) What is her velocity at the end of the race?

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