# physics

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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 -

Both of these are straightforward uses of standard formulas. I will be happy to critique your thinking.

• physics -

i'm not very good at physics

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

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