thecentre ofgravityofa bodyon theearthcoincides with itscentreofmass fora smallobject whereasfor anextendedobject it maynot ,whatis thequalitaitve meaningof smallandextended in thisregard ? for whichof thefollowingtwo coincides ? A building, a pond , a lake ,amountain?

thecentre ofgravityofa bodyon theearthcoincides with itscentreofmass f

1.	thecentre ofgravityofa bodyon theearthcoincides with itscentreofmass fora smallobject whereasfor anextendedobject it maynot ,whatis thequalitaitve meaningof smallandextended in thisregard ? for whichof thefollowingtwo coincides ? A building, a pond , a lake ,amountain?
Answer» SOLUTION :whentheverticalheightof THEOBJECT is verysmallas compared to THEEARTH 'sradius, wecall the object small,otherwiseit isextended . (i)Buildingandpond aresmallobjects. (ii)A DEEP lakeanda mountainare examples of extended OBJECTS .