Posted by **Mark** on Sunday, February 27, 2011 at 12:39pm.

If a masss of 65kg is dropped 4.3m onto a spring with a stiffness coefficient of 6.2x10^4 n/m, how far is the spring depressed?

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**drwls**, Sunday, February 27, 2011 at 12:42pm
M g (H +x) = (1/2)kx^2

Solve for x.

H = 4.3 m

k is the spring constant

M is the mass

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**Mark**, Sunday, February 27, 2011 at 1:10pm
Thanks

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**drwls**, Sunday, February 27, 2011 at 1:15pm
You're welcome.

They may want you to solve it without the x on the left side. That will give you nearly the same answer, and make solving easier, but it will be wrong. Gravity continues to act as the spring is compressed.

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**hollie**, Friday, May 15, 2015 at 12:16pm
how much force is required to accelerate an 8.00 kg mass at 15.00 m/s2?

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