Exercise 6.7 Two blocks are connected by a very light string passing over a mass

Question

Exercise 6.7 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-N block moves 77.0 cm to the right and the 12.0-N block moves 77.0 cm downward. Figure 1 of 1 20.0 Part A During this process, how much work is done on the 12.0-N block by gravity? W 9.24 J Give Up My Answers Correct Part B During this process, how much work is done on the 12.0-N block by the tension in the string? W -9.24 J Submit MLAnswers Give up Correct Part C During this process, how much work is done on the 20.0 N block by gravity? My Answers Give Up

Explanation / Answer

(G)

The work done on the 12.0 N block by the gravity is,

W=mgh

=12.0 N * 0.77 m

=9.24 N

(H)

From the law of conservation of energy, the work done on the 12.0 N block is equal to the work done on 20.0 N block. since there is no friction.

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