A runner of mass 58.1 kg starts from rest and accelerates with a constant acceleration of 0.87 m/s2 until he reaches a velocity of 5.90 m/s. He then continues running with this constant velocity.(adsbygoogle = window.adsbygoogle || []).push({});

How long does the runner take to run 193 m?

I already know mass has no relation to what I'm suppose to find here. What I first did was use v=v(initial) + at to find the time it takes to get up to 5.90 m/s. Then I found the distance covered during this time. I then used x=x(initial) + vt and solved for t to find the rest of the time from when the runner started to run 5.90 m/s up to the end of his 193 m run. Then I add the both times together. I get 32.71 s, but the answer is not correct. This is one of those online questions. What am I doing wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Velocity, distance, time problem

**Physics Forums | Science Articles, Homework Help, Discussion**