- #1

Ben_Walker1978

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## Homework Statement

I need help with the following question:

A pile-driver has a hammer mass of 1000 kg which is dropped onto a pile from a height of 5 meters. The pile is driven 0.5 meters into the ground. The pile has a mass of 500 kg. Calculate the retarding force exerted by the ground on the combined mass of the pile and hammer.

Thanks,

## Homework Equations

## The Attempt at a Solution

So far i have this, this is for the hammer hitting the pile:

PE = Mgh

M = 1000Kg

g = 9.81 m/s

h = 5 meters

1000 x 9.81 x 5 = 49050 Joules

V^2 = 2gh

Square root of 2 x 9.81 x 5 = 9.9 m/s^1

Velocity = 9.9 m/s^1

But i am now stuck. How do i work out the pile going 0.5 meters into the ground. And the retarding force?

Can anyone help please?