Thursday

January 29, 2015

January 29, 2015

Posted by **Ajani** on Thursday, May 17, 2012 at 6:42am.

- Physics -
**drwls**, Thursday, May 17, 2012 at 6:51amStart time measurement from when the separation distance, Xa - Xb, is 2.0 m.

Xa - Xb = 2.0 +(6-5)*t + (1-2)t^2

= 2 +t -t^2 = 0

t^2 -t -2 = 0

(t-2)(t+1) = 0

Solve for t. Take the positive root.

t = 2.0 s.

- Physics -
**Ajani**, Thursday, May 17, 2012 at 6:56amThank you! i have spent an hour on that question. Which equation was that?

s=ut+at^2/2 ?

- Physics -
**drwls**, Thursday, May 17, 2012 at 8:13amYes, the equation for Xa - Xb results from

s = so + uo*t + a*t^2/2

where so is the displacement at t = 0

**Answer this Question**

**Related Questions**

math/physics - During a race, one runner runs at a 6 min/mi pace and another ...

Math - Runner A crosses the starting line of a marathon and runs at an average ...

physics - Suppose runner A starts at the 0 degree mark on a circular track (...

physics - In an 8.00 race, one runner runs at a steady 11.8 and another runs at ...

Physics Help!!!! - A runner in a relay race runs 20m north, turns around and ...

physical science - I am having a little trouble with this problem. can someone ...

Physics - Runner A is running at a constant rate of 2.3 m/s when he passes ...

science - after 30s, a runner is spriting at 3m/s. But, 10s later, the runner is...

physics - Sprinting near the end of a race, a runner with a mass of 70 kg ...

physics - A runner is moving at a constant speed of 8.00 m/s around a circular ...