If stretching a spring 3.50m causes a force of 20.0N, what is the spring constant of the spring? A. 5.71 N/m
B. 70.O N/m
C. 16.5 N/m
D. 23.5 N/m ​

A

Explanation:

Remark

One of the handiest things to know in physics is something called dimensional analysis.

Look at the answers you are given. All of them are in N/m. That means 2 things.

No conversions are necessary

You divide Newtons / meters. You don't need to worry too much about a formula.

But if need a formula, it is F = k * x and you need k

x = 3.5 m

F = 20.0 N

k = F / x

k = 20.0/3.5

k = 5.71 to 3 places.

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