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A man drags a sack of flour of mass 50 kg at constant speed up an inclined plane to a height of 5 m. The plane makes an angle of 30 degrees with the horizontal and a constant frictional force of 200N acts on the sack down the plane.
Calculate the work that the man does against:
1. Friction
2. Gravity
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Answer:
W.D against Friction is 500√3
W.D against gravity is 0
Step-by-step explanation:
W.D= F. d cosθ
= 200N × 5m × cos30°
= 1000×√3/2
= 500√3 joule
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