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 $15^{\circ}$ with the horizontal is

9.36 kJ

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5.17 kJ

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18.91 kJ

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19.82 kJ

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Solution

The correct option is B 5.17 kJ
$W = m g s i n θ \times s$
$= 2 \times 10^{3} \times s i n 15^{\circ} \times 10$
$= 5.17 k J$

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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 $15^{\circ}$ with the horizontal is

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