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Retarding force, freely moving object, impact stationary object, rest without rebound

  • #1

Homework Statement


A mass of 150 KG is dropped onto a pile of mass 1,200 kg from a height of 2.5m and drives it 7cm in to the ground. calculate (a) the initial veocity of pile and driving weight immediately after impact, (b) the average resisting force excerted by the ground.


Homework Equations


Not sure Please help.


The Attempt at a Solution


None worth writing please post a soloution and a step by step guide on how to solve the problem.
 

Answers and Replies

  • #2
nvn
Science Advisor
Homework Helper
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JamesTheEng: You must list relevant equations yourself, and show your valid work; and then someone might check your math. We are not allowed to provide answers here. We can only check your math, after you do all of the work.
 
  • #3


ok thank you, here is my attempt not fully done but could you let me know if im on the right track?..
1st i apply this formula to find the velocity
V= Squareroot (2xGravityxheight) = 7.004

Then i put in the knowns i have in to the equation V²=U²+2as to find accelleration

7.004²=0²+(2x(a)x(2.5)) i transpose and come to 9.8112

I then Apply newtons 2nd law F=MA

9.8112x150= 1471.68N

Am i on the right track please message back.
 

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