Posted by vinay on Sunday, October 7, 2012 at 1:46pm.
vf=vi+at
Hmmm. I am wondering if you meant 12m/s and 18m/s. I will assume so.
12=vi+2a
18=vi+4a
subtract first from second equation
6=2a a=3 m/s^2
12=Vi+2*3 solve for vi
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