# physics

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In 0.511 s, a 13.1-kg block is pulled through a distance of 3.13 m on a frictionless horizontal surface, starting from rest. The block has a constant acceleration and is pulled by means of a horizontal spring that is attached to the block. The spring constant of the spring is 466 N/m. By how much does the spring stretch?

• physics -

F=ma=kx

k=ma/x

so what is acceleration a?

vaverage=3.13m/.511s
vfinal then must be twice that, or 6.26/.511

but we know

Then, solve for k from k=ma/x

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