The work done in slowly pulling up a block of wood weighing 2 kN for a length of 10m on a smooth plane inclined at an angle of 150 with the horizontal by a force parallel to the incline is :
4.36 kJ
5.17 kJ
8.91 kJ
9.82 kJ
A
9.82 kJ
B
5.17 kJ
C
4.36 kJ
D
8.91 kJ
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Solution
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w=Force×displacement
=(2sin15∘)×10
=5.17kg
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