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Retarding force impacting a stationary object 
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#1
Jun1311, 03:26 PM

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Please can you check and if i have gone wrong tell me?
1. The problem statement, all variables and given/known data A mass of 150 kg is dropped onto a pile of mass 1,200kg from a height of 2.5m and drives it 7cm into the ground. calculate (a) the intial velocity of pile and driving weight immediately after impact, (b) the average reisting force exerted by the ground. 150kg gravity 9.81 1200kg 2.5m 7cm0.07m 2. Relevant equations m1u1+m2u2=m1v1+m2v2 V²=u²+2as F=ma Mgr=MA 3. The attempt at a solution Here is my attempt not the best. Intial velocity of pile and driving weight after impact m1u1+m2u2=m1v1+m2v2 (1200x7)+(150x0)=(1200+150) 8400=1700 (a)v=3.8m/s combired velocity after impact caculating deccelration V=0m/s combined mass V²=u²+2as 0=14.44+(2xax0.07) 0=14.44+0.14a a=103m/s² Resitance F=MA MgR=MA (b) (1700x9.8)R=(1700x103) 16660R=175100 16660+175100=R R=191700N 


#2
Jun1311, 06:10 PM

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