1. The problem statement, all variables and given/known data In a stage production of Peter Pan, the 63 kg actress playing Peter has to fly in vertically, and to be in time with the music, she must be lowered, starting from rest, a distance of 2.6 m in 2.2 s. Backstage, a smooth surface sloped at 58 supports a counterweight of mass m. What is the mass of the counterweight that must be used? The pulley is of negligible mass and is frictionless. The acceleration of gravity is 9.81 m/s2 . 2. Relevant equations y-y0 = Vot + 0.5at^2 m1a = T - m1gsin 58 m2a = m2g - T 3. The attempt at a solution I already got the answer. a= 1.07438 m/s^2 m1=58.57211916 kg My question is, why is y - y0 positive? Should it not be negative since Peter Pan is lowered, making y < y0 which y0 = 2.6?? If I make y - y0 = -2.6, then I do not get correct value of the mass.