Lecture 12 ACT 1 Work a box is pulled up a rough(u>0)incline by a rope-pulley weight arrangement as shown below How many forces are doing work on the box (a)2 (b)3 (C) Physics 121: Lecture 12, Pg 8Physics 121: Lecture 12, Pg 8 Lecture 12, ACT 1 Work A box is pulled up a rough (m > 0) incline by a rope-pulley￾weight arrangement as shown below. How many forces are doing work on the box ? (a) 2 (b) 3 (c) 4