Posted by Ajani on Thursday, May 17, 2012 at 6:42am.
Start 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.
Thank you! i have spent an hour on that question. Which equation was that?
s=ut+at^2/2 ?
Yes, the equation for Xa - Xb results from
s = so + uo*t + a*t^2/2
where so is the displacement at t = 0
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