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100-meter dash

  • #1

Homework Statement



A sprinter can accelerate with constant acceleration for 3.40 s before reaching top speed. He can run the 100-meter dash in 10 s.

What is his speed as he crosses the finish line? (in m/s)

Homework Equations



kinematic equations

The Attempt at a Solution



a (acceleration) is positive and nonzero for the first 3.40 s

a is zero for the last 6.60 s
 

Answers and Replies

  • #2
learningphysics
Homework Helper
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What is the distance covered in the first 3.40s? What is the distance covered in the last 6.60s ?
 
  • #3
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