A lawn roller is pulled along a horizontal surface through a distance of 20m by a rope with a force of 200N. If the rope makes an angle of 60∘ with the horizontal while pulling, the amount of work done by the pulling force is:
1000J
4000J
2000√3J
2000J
A
1000J
B
2000J
C
4000J
D
2000√3J
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Solution
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W.D in pulling rope =→F.d→s =200×20cos600 =2000J
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