300 J of work is done in sliding a 2 kg block up an inclined plane of height 10m. Taking g = 10 m/s ^2, work done against friction is

NEET 2006 Physics question

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10m. Taking , work done against friction is

(1)200 J
(2)100 JCorrect
(3)Zero
(4)1000 J

Answer: (2)

Solution

The work done on the block (300 J) goes partly into raising it through height (gain in potential energy) and partly against friction (assuming it starts and ends at rest, no change in kinetic energy). Work against

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Question ID VK-089553