1. The problem statement, all variables and given/known data Two blocks are connected by a string that passes over a massless, frictionless pulley, as shown in the figure. Block A, with a mass mA = 4.00 kg, rests on a ramp measuring 3.0 m vertically and 4.0 m horizontally. Block B hangs vertically below the pulley. Note that you can solve this exercise entirely using forces and the constant-acceleration equations, but see if you can apply energy ideas instead. Use g = 10 m/s2. When the system is released from rest, block A accelerates up the slope and block B accelerates straight down. When block B has fallen through a height h = 2.0 m, its speed is v = 5.00 m/s. a) Assuming that no friction is acting on block A, what is the mass of block B? (b) If, instead, there is friction acting on block A, with a coefficient of kinetic friction of 5/8, what is the mass of block B? 2. Relevant equations I'm considering the the whole system in my equation KEi+ Ui + Wnc= Kf+Uf FN= mghcos Fkinetic friction = (coefficient of kintetic friction)mghcos W= Fk(displacement) 3. The attempt at a solution A. KEi+ Ui = Kf+Uf 0 + m(10)(2) = 0.5m(5)2+ 4(10)(2) m= 10.67 B. FN= mghcos Fkinetic friction = (coefficient of kintetic friction)mghcos (.625)80cos(36.87) = 40 W= Fk(displacement) = 40(5) = 200 20m +200 = 12.5m +80 m=16 I included a picture below if my work and equations are not clear. Sorry, i'm not very good at inserting symbols. Thank you!