(8-22) Two masses are connected by a string as shown in Fig. 8-34. Mass mA = 4.0 kg rests on a fric

(8-22) Two masses are connected by a string as shown in Fig. 8-34. Mass mA = 4.0 kg rests on a frictionless inclined plane, while mB = 5.0 kg is initially held at a height of h = 0.75 m above the floor, (a) If mB is allowed to fall, what will be the resulting acceleration of the masses? (b) If the masses were initially at rest, use the kinematic equations (Eqs. 2-12) to find their velocity just before mB hits the floor, (c) Use conservation of energy to find the velocity of the masses just before raB hits the floor. You should get the same answer as in part (b).

[robertjr]

Why is it MbG - Ft = MbA instead of Ft - MbG = MbA? Should tension be positive for box B