[" 11: A small block "B" is placed on another block "A" of mass "],[5" kg and length "20" cm.Initially the block "B" is near the "],[" right end of block "A" (figure "5" -E3).A constant horizontal "],[" force of "10N" is applied to the block "A" .All the surfaces "],[" are assumed frictionless.Find the time elapsed before "],[" the block "B" separates from "A],[qquad (10N)/(1)=A],[qquad " Figure "5-E}]