Homework Help: phy

Posted by lvf on Tuesday, October 9, 2012 at 2:42pm.

force in the x-direction with magnitude Fx=18N-(0.530N/m)x is applied to a 5.50 box that is sitting on the horizontal, frictionless surface of a frozen lake. is the only horizontal force on the box.
what is the speed after 12m. starting from rest and x=0

phy - Elena, Wednesday, October 10, 2012 at 8:14am
F=18-0.53•x
a=F/m=(18-0.53•x)/5.5
v=sqrt(2•a•x)=sqrt[(18-0.53•x)x/5.5]=
= sqrt[(18 - 0.53•12) •12/5.5=5.04 m/s
phy - n8, Sunday, November 11, 2012 at 12:17am
the first answer is wrong

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