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Work Done When Path Is Not Straight

A block of ma...

Question

A block of mass 2kg is released from A on the track that is one quadrant of a circle of radius 1m. It slides down the track and reaches B with a speed of and finally stops at C at a distance of 3m from . The work done against the force of friction is

A

10 J

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B

20 J

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C

2 J

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D

6 J

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Solution

The correct option is B
20 J

Block possess potential energy at point $A = m g h = 2 \times 10 \times 1 = 20 J$

Finally block stops at point C . So its total energy goes against friction i.e. work done against friction is 20 J .

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