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## Homework Statement

A very short 100 kg acrobat steps off a 10 m high platform and

starts falling. The acrobat falls 9 m, then encounters a 1 m long

spring connected at one end to the ground below. (a) What’s the

spring constant so the acrobat just touches the ground (that is, so the

spring contracts 1 meter)? The spring-with-acrobat system rebounds

and launches the acrobat back into the air. (b) How high off the

ground does the acrobat go above the ground before falling back?

## Homework Equations

(1/2)k(x-x0)^2

mgΔh

## The Attempt at a Solution

To solve this, wouldn't one set the gravitational potential energy (mgh) to the spring potential energy (1/2kx^2) because the energy converts to one another, then solve for k? 1.96 * 10^4 N/m is the answer I got.

For the second part of the problem, the acrobat will be the same exact height above the ground because the energy is conserved, right?

Am I missing something in this problem? This was unexpectedly simple.