A body of superdense material with mass twice the mass of earth butsize very small compared oto the size of earth starts from rest from h<<R above the earth's surface. It reaches earth in time
1and thnx for d answer shreyan and abhi............... d threadkeepers love u for d gr8 reply...
11Abhijeet, if the size of the object is small, then the center of mass won't be 2h/3. It will be 2R/3, won't it?[7]
1see i just saw the question and posted the solution i thought was the simplest forgive me bcoz i don't think i can read through all those 7 pages
here is my soln.
let a1 be the acc. of earth (mass Me)
and a2 be the acc. of the mass 2Me
then using laws of gravitation and as h<<R
a1=2GMe/R2 (rem h<<R)
a2=GMe/R2
arelative=3GMe/R2
h=1/2arelativet2
now what is so complicated in this and btw where does C.O.M came in b/w
hope this explains it well
P.S. = g=GM/R2
3philip thnx for ur reply.i never thought that this thread will go for 7 pages while posting this thread
sory guys for those who participated in this thread for wasting ur time.
1thanx is not important
what is important is whether your doubt is cleared
whether you understood what i said ?
hope you got my solution