House painter and pulley

[ElectricMile]

this is a problem i have gotten on my homework, but this problem is giving me a bit of trouble does anyone know the best way to approch it? i was using ((Ms - Mm)/(Ms+Mm))* X = 0.2
X being the force he must pull down on

A house painter uses the chair and pulley arrangement of the figure to lift himself up the side of a house. The painter's mass is 70 kg and the chair's mass is 10 kg. With what force must he pull down on the rope in order to accelerate upward at .2 m/s

[ElectricMile]

been trying to work on this, i was wondering should g be a factor in the equation?

[Doc Al]

Since you did not include the figure, I can only make a guess as to the problem. I assume the painter is pulling himself up via a pulley and rope.

As always, identify all the forces acting on the "painter + chair" (treat them as a unit). Note that the painter pulls down on one end of the rope, but both ends of the rope pull up on him.

You may find this discussion helpful: http://www.physicsforums.com/showthread.php?t=46892