# A problem from conservation of energy.

1. The problem statement, all variables and given/known data
Hi everyone, my teacher gave this problem as an extra credit for last exam, which I just did very bad.

The figure is attached to the post.
There are 2 objects, which have the same mass (m). 2 objects are connected to each other by a string length (L), which is massless.
At initial, the they are sitting on a vertical wall, no velocity, and there is NO friction.
It start sliding down to another wall which is 30 degrees to the horizontal.

So, we just have (m): mass of object 1 and 2, (L): length of string, and 30 degrees is the angle between horizontal plan to the wall it start sliding down.

2. Relevant equations
Determine the velocity of 2 objects at some time after the motion (there is no exact point of time, it could be "t")
The hint is: object #v1 object #2 have the same velocity. (because they have a string between)

3. The attempt at a solution
I tried to do it by using conservation of energy, but I cannot go all the way because I can just figure out one equation but there is 2-3 unknowns.
However, by doing other homework, I pretty sure that there is no normal force of the wall acting on 2 objects. (because if you do some home work, the result are usually v=sqrt(2gh). And my teacher also confirmed so. 1940217_283948788429548_1550090374_n.jpg (45.9 KB)