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July 23, 2014

July 23, 2014

Posted by **falcon306** on Wednesday, August 10, 2011 at 10:46pm.

What was the mass of the second block?

How do you set this equation up? I tried a couple of different ways and nothing worked, I only have one attempt left before I get the question wrong. Please help

- Physics Help -
**drwls**, Wednesday, August 10, 2011 at 11:09pmUse conservation of linear momentum.

M1*V1 + M2*V2 = (M1+M2)*V3

The only unknown is M2 in this case, so you can solve for it.

1.9*1.8 + M2*4.5 = (1.9 + M2)*3.5

3.42 + M2 = 6.65

M2 = ____ kg

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