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This is what I tried to do:

I used Hooke's law: F[tex]_{}s[/tex]= k*x

and solved for the k which is spring constant.

Then I wasn't too sure of how to find the spring compression when he jumps from a height of 1m. I tried to use conservation of mechanical energy:

I did the potential energy of the the guy at 1m and set it equal to the kinetic energy when he hits the scale.

I then set up another conservation of mechanical energy for the scale. Which was Kinetic energy equal to the compression 1/2kx^2.

This is wrong however and I have no clue what else to try.

Thanks for the help