A sprinter, starting from rest, accelerates off the starting line at 3 m/s2 for 3 s, runs at a constant speed until crossing the finish line 100 m from the starting line, and then slows to a stop over the next 20 m.

a) How long does it take for the sprinter to cross the finish line?

b) At what speed does the sprinter cross the line with?

c) What is the sprinters deceleration during the 20 m after the finish line?

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