http://img213.imageshack.us/img213/6969/physicsproblemhq3.png [Broken] A rope of negligible mass passes over a pulley of negligible mass attached to the ceiling as shown above. One end of the rope is held by Student A of mass 70 kg, who is at rest on the floor. The opposite end of the rope is held by Student B of mass 60 kg, who is suspended at rest above the floor. The first 2 questions asked for simple calculations, but now questions (d) and (e) ask: (d) As Student B is accelerating at .25 m/s^2, is Student A pulled upward off the floor? Justify your answer. Now I do not quite understand this..I guess it makes sense since the acceleration is so small, it doesn't have enough Fnet to make Student A go upwards. But (e) is as follows: With what minimum acceleration must Student B climb up the rope to lift Student A upward off the floor? I do not understand how to calculate this. I have the answer as 1.6 m/s^2 as per my teacher's key. If anyone could explain how to arrive at this answer please help me out! I have completed FBDs for these two Students so it would be fine to speak to me in terms of the forces. Thanks to anyone who could help me with this!