The work done in pulling up a block of wood weighing 2 kN for a length of 10m on a smooth plane inclined at an angle of 15° with the horizontal is

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4.36 kJ

5.17 kJ

8.91 kJ

9.82 kJ

answer is B.

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Detailed Solution

W=mgsinθ×s=2×103×sin⁡15∘×10 =5.17kJ

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