Kinematics Equations Video Lessons

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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?

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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 Kinematics Equations concept. You can view video lessons to learn Kinematics Equations. Or if you need more Kinematics Equations practice, you can also practice Kinematics Equations practice problems.

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