A man of mass 60kg lifts a 15kg mass to the top of a building of height 10m is 5minutes. H is efficiency is

A man of mass 60kg lifts a 15kg mass to the top of a building of heigh

1.	A man of mass 60kg lifts a 15kg mass to the top of a building of height 10m is 5minutes. H is efficiency is
Answer» 0.1 0.2 0.3 0.4 Answer :B