Question

a chain of length l and mas m overhangs at the edge of a smooth table with two third part lying on the table .the K.E ot cahin when it is completely slip off the table when released

Answer 1

the change in kinetic energy = loss in potential energy.
loss in potential energy =
initial U = m×g×l/18
final U =m×g×l/2
change in U=4mgl/9