- #1
frog210293
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Homework Statement
A runner is planning for a 10km race. She can maintain a steady speed of 3.7 m/s for as much time as needed before ending the race with a 7.8 m/s sprint. If she wants to finish in 40min or less, how far from the finish should she begin to sprint?
Homework Equations
S = d / t
The Attempt at a Solution
10 000m - distance
3.7m/s - speed
10 000/3.7
=2702.702s - time it would take if only running 3.7m/s
40*60= 2400s - time needed to complete the race in
2400s - 2702.702s
=302.702s
=302.7s / 7.8m/s
2361.075m - this answer is wrong. can anyone see what i have done wrong, thanks