Work Energy And Power Question 234

Question: A block of mass 1 kg is pulled along the curve path ACB by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is

Options:

A) 5 J

B) 10 J

C) 20 J

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Work done by friction

$ =\int{\vec{F}.\overrightarrow{ds}=\int\limits_0^{x}{\mu mg\cos \theta \frac{dx}{\cos \theta }=\mu mgx=20J}} $



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