# Homework Help: Simple i think

1. Sep 25, 2007

### lostfan176

1. The problem statement, all variables and given/known data
Ed, the leading runner in a race taking place along a straight track, is traveling at his top speed, a constant 10.0 m/s. He has been 4.1 m in front of Harry, his chief rival, for the last 10.0 s. But aware that Ed will hit the finish line in 15.0 s, Harry puts on a burst of speed. At what minimum constant rate must he accelerate if he's not to lose the race?

2. Relevant equations

kinetics

3. The attempt at a solution

i tried most of them 154.1/15 154.1/.41

wats the setup?

2. Sep 25, 2007

### hage567

What is this? That surely isn't "most of them"! Where did the 154.1 come from? Explain your reasoning. Make a list of what info you need to find and what you already have.

3. Sep 25, 2007

### lostfan176

150+4.1 cause ed finishes the race in 15 and goin at 10 m/s its 150 m away
and harry is 4.1 m behind so thats how i got 154.1

4. Sep 25, 2007

### lostfan176

nvm
154.1 = 0 + 10(15) + 1/2x(15^2)

x = .036