- #1
clicwar
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Homework Statement
A lever of length 3L can rotate freely around a horizontal axis O.
The end of each arm "2L" and "L" of the lever has one mass : "4m" and "9m" , respectively.
Find the velocity of mass "9m" at the bottom.
Consider that the lever was initially at rest in the horizontal position.
Homework Equations
The problem is in a chapter of work and energy, before the conceps of torque and moment of inercia, so i guess that only energy and work can solve this.
But any solution/hint with any method will be welcome.
The Attempt at a Solution
I'm trying to apply conservation of energy, but I'm confused if the whole system is conservating energy or only part of it.
I really need a hint of how start this problem or if possible a solution of it.
Thanks in advance!