Two blocks are connected by a very light string passing over a mass less and frictionless pulley

Question:

Two blocks are connected by a very light string passing over a mass less and frictionless pulley (Figure 6.30). Traveling at constant speed, the 20.0-N block moves 75.0 cm to the right and the 12.0-N block moves 75.0 cm downward. During this process, how much work is done
(a) On the 12.0-N block by (i) gravity and (ii) the tension in the string?
(b) On the 20.O-Nblock by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force?
(c) Find the total work done on each block.

Two blocks are connected by a very light