First slide

Work

Question

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

Moderate

A

4.36 kJ
B

5.17 kJ
C

8.91 kJ
D

9.82 kJ

Solution

$W = mgsinθ \times s$ $= 2 \times 10^{3} \times \sin 15 ° \times 10$ $= 5 .17 kJ$

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