Two blocks are connected by a very light string passing over a massless and fric

Question

Two blocks are connected by a very light string passing over a massless and frictionless pulley (the figure (Figure 1) ). Traveling at constant speed, the 20.0- block moves 79.0 to the right and the 12.0- block moves 79.0 downward.

During this process, how much work is done on the 12.0- block by the tension in the string?

During this process, how much work is done on the 20.0- block by gravity?

During this process, how much work is done on the 20.0- block by the tension in the string?

During this process, how much work is done on the 20.0- block by friction?

During this process, how much work is done on the 20.0- block by the normal force?

Explanation / Answer

since no figure is given, assuming 19.0-N block moves horizontally, 12.2-N block moves vertically down Net force by 12.2-N block = 12.2N system mass = (19 + 12.2) / 9.81 = 3.18kg However, given that system mass ""Traveling at constant speed"" so force on system mass = 3.18 * 0 (acceleration) =0 work is done on the 19.0-N block by gravity = force * 1.13 = 0 * 1.13 = 0 J answer

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