Finding Restoring Force for Simple Harmonic Motion: 700g Cylinder in Water

[kimi70]

Homework Statement

a 700 g cylinder of base area a=30 cm^2 and height 40 cm is floating upright in water. A 50 g mass, resting on top of the cylinder is suddenly removed. find the restoring force.

Homework Equations

The Attempt at a Solution

 

[tiny-tim]

hi kimi70!

show us what you've tried, and where you're stuck, and then we'll know how to help!