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Given:

Mass of Child: 28.86kg

Spring constant 18016N/m

Acceleration after spring was compressed: 4.802 m/s^2

Find:

x=?

2) Relevant Equations

Hooke's Law: F=-kx

Newton's second Law: F=ma

3) Attempt at solution:

All I set up was that F=(Mass of Child + Mass of Pogo stick)a.

Then set that equal to -kx. But as you can see there are two unknowns.

If I'm neglecting any other principle that would help solve this problem. I'd be most gracious if you could tell me. Thanks

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**