- #1

Alex Christie

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## Homework Statement

i have a question on D'alemberts principle in which it asks me to find the velocity of a hammer immediately before impact with a pile

the information i have been given is as follows:

mass of hammer;300kg

height of hammer;3.5m

gravity to be taken as;9.81

mass of pile ;500kg

I have solved the question using the conservation of energy technique in which

KE = GPE

0.5mv^2 = mgh

0.5x300xv^2 = 300x9.81x3.5

v=square root of 9.81x3.5/0.5

v=8.287m/s

## Homework Equations

KE=1/2mv^2

GPE=mgh

F=Ma=-Fi

## The Attempt at a Solution

all attempts at a solution have proved to be futile as i cannot wrap my head around it, i have read about inertia forces and that an applied force must overcome this inertia force in order to accelerate however I am stumped when it comes to this question Any help would be massively appreciated