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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 im stumped when it comes to this question Any help would be massively appreciated