Problem: 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?

🤓 Based on our data, we think this question is relevant for Professor Dickman's class at OAKTON.

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Problem Details

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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Our tutors have indicated that to solve this problem you will need to apply the Motion with Multiple Parts concept. You can view video lessons to learn Motion with Multiple Parts. Or if you need more Motion with Multiple Parts practice, you can also practice Motion with Multiple Parts practice problems.

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Based on our data, we think this problem is relevant for Professor Dickman's class at OAKTON.