# physics

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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?

• physics -

k=force/distance

moving at a constant veloicty? Well you have to supply force equal to friction: mg*mu

• physics -

k=F/x
=1800/0.4
=4500 N/m

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