Calculating the applied retarding force

[joejoe998]

Homework Statement

An iron ball with a mass of 30kg falls freely from a height of 30m and impacts with the ground without rebounding.

It enters into the ground and is brought to rest at a depth of 8m.

Calculate the applied retarding force.

Homework Equations

The Attempt at a Solution

 

[haruspex]

Homework Statement

An iron ball with a mass of 30kg falls freely from a height of 30m and impacts with the ground without rebounding.

It enters into the ground and is brought to rest at a depth of 8m.

Calculate the applied retarding force.

Homework Equations

The Attempt at a Solution

You must complete the template. Quote any standard equations you believe may be relevant and show some attempt.
The attempt might just consist of your thoughts on the matter.

 

[CWatters]

8m penetration sounds a lot, perhaps double check that isn't 8mm?