## 3 Sliding Masses; find speed

Let's assume they are. haha

Now, add up all the equations. The tension forces will cancel leaving you with.....

$\Sigma$F = m$_{3}$g - m$_{1}$g = m$_{1}$a + m$_{2}$a + m$_{3}$a

So, factor out a g from the left side, and an a from the right side.....

g(m$_{3}$-m$_{1}$) = a(m$_{1}$ + m$_{2}$ + m$_{3}$)

Solve for a and that will give you the acceleration of each block.

m1 = 1.0 kg
m2 = 7.0 kg
m3 = 3.0 kg

 where did m2g go?
 m2g canceled out because the equation for M2 included..... m2g - m2g = 0 So, that's why they canceled out.
 It doesn't matter, i timesed that by the time and i got the answer :d

 Tags masses, speed