Find the mass of M1 and M2

1. Oct 10, 2008

ScullyX51

1. The problem statement, all variables and given/known data

The figure (Intro 1 figure) shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 0.150 kg. What are the masses of objects 1 and 3?
(I've attached the figure.....hopefully it will show up)

2. Relevant equations
F=ma

3. The attempt at a solution
I'm super lost on this one...could use all the help I can get!

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2. Oct 10, 2008

LowlyPion

F = M*a

This means that

$$F_{(a)} = m * a$$

That means that the slope of the F is the mass as in

$$\frac{dF_{(a)}}{da} = m * \frac{da}{da} = m$$

So if the slope of 2 is given as .15 kg and on the graph it has a slope of ...?
Then the slope of 1 and 3 compared to 2 should reflect their masses.