Posted by **sammi** on Wednesday, October 15, 2008 at 9:41pm.

i'm not very good at physics and i have an exam tomorrow!!

for the first one do i use the formula F=-Kx to make the answer -4500 ?

and for the second i really have no idea what formula to use

what is the value for k if a spring stretches 0.4m when submitted to a 1800N force?

How much force is needed to keep a 23 kg box moving at a constant velocity across a warehouse floor if the coefficient of friction between the box and the floor is 0.88?

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