Speed of half a chain falling off of a table

[marti423]

Homework Statement

A uniform chain of total mass m is laid out straight on a frictionless table and held stationary so that one-quarter of its length, L = 2.87 m, is hanging vertically over the edge of the table. The chain is then released. Determine the speed of the chain at the instant when only one-quarter of its length remains on the table.

Homework Equations

The Attempt at a Solution

 

[tiny-tim]

welcome to pf!

hi marti423! welcome to pf!

use conservation of energy …

what do you get? ​