1. The problem statement, all variables and given/known data We hope to use Atwood's machine to measure gravitational accleration with an accuracy of 5% [(Delta g)/g = 0.05]. Mass m1 is heavier than m2 and it falls through a distance L. We are able to measure time with accuracy of (Delta t) = 0.1s. If we say, for any x, (delta x)/x can be expressed as the differential dx/x, write the relationship between (Delta g)/g and (Delta t)/t. 2. Relevant equations 3. The attempt at a solution Suppose T as a tension in the rope. from m1g - T = m1a T - m2g = m2a, g = (m1+m2)g/(m1-m2). From L = 1/2at^2, a = 2L/t^2. Therefore, g = 2L(m1+m2)/[(m1-m2)t^2] I can't go further from this step... any idea to solve this problem??