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Q.
The work done in pulling up a block of wood weighing $200N$ for length of $10 m$ on a smooth plane inclined at an angle of $30^{\circ}$ with the horizontal is
Work, Energy and Power
Solution:
$ w=mg \sin \theta \times s =m g \sin 30^{\circ} \times s $
$w =200 \times 10 \times \frac{1}{2} \times 10 $
$ w =10^{4} J=10 kJ $
