Question

A chain is held on a frictionless table with1/n th of its length hanging over the edge. if the chain has a length l and a mass m how much work is required to pull the hanging part back on the table

Answer 1

draw a random situation.
now mass of per unit length chain is m/l .
F= m/l (l-n)g
dw =integration m/l (l-n)g dn; put limits from n to l . u will get it answer.
hope answer will help you . if you like my answer please follow me.yo dude