1. The problem statement, all variables and given/known data atwood machine: pulley with negligible mass and frictionless with 2 blocks hanging at rest. The first block "m" has a mass of 3.66kg The second Block "M" is unknown The blocks are released; block M accelerates at .255*g m/s2 downward Find the mass of block "M" Hint: There are 2 solutions. 2. Relevant equations F=ma a= (Mg-mg)/(m+M) 3. The attempt at a solution I rearranged the equation to M=m(a+g)/(g-a) and solved getting 6.17 as my first answer but I can't figure out how to get a second solution after trying a few different ways that which all lead me to 6.17 (pretty much different forms of the acceleration formula, kinda lost). How else can I get the mass of M with what I'm given? Also, was my first answer correct?