1. The problem statement, all variables and given/known data "Calculate the acceleration of an Atwood machine if one of the two weights is four times as heavy as the other. What is the tension in the string if the lighter body has a mass of 3kg? Find also the time for this mass to cover a distance of 0.45 meter." So: *Given: m1=3kg (the lighter one) m2=12kg(?) (four times heavier) d=0.45m *Find: 1)acceleration 2)time 3)tension 2. Relevant equations I'm a little confused about this. First the formula for acceleration is F=ma--> a=F/m. But there are few things missing to complete it. Time meanwhile, I'm clueless on how to find it since there are quite a number of formulas to find time such as d=vt--> t=d/v but there aren't anything given about v. Tension meanwhile, is not that much of a problem for me. 3. The attempt at a solution So I first tried solving for the acceleration. a=F/m. But there aren't any given about force. Meanwhile, a=dt^2. But d I think is displacement which is different from the other given d of mine which is distance. Second I solved for time. I've tried all formulas I know for solving time but then still won't work. I need a little assistance about these. Thanks in advance.