collie carries 5kg load on his head and covered 500m distance in straight herizontal path .the work done by the collie is: (A) positive (B) negative (C) zero (D) lot of work
please help me
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1
Answer:
Option C
Zero
Explanation:
★ Work done ( W ) = Force × displacement cos ∅
W = 5 × 10 × 500 × cos 90° [ angle between force and displacement ]
W = 50 × 500 × 0 = 0 J
[ As ; Collie moves forward displacement is in forward direction and the load on his head has gravity effect and force downwards so ; angle is 90° and cos 90° is 0 ]
Hope it helps you
Answered by
0
Answer:
Answer:
Option C
Zero
Explanation:
★ Work done ( W ) = Force × displacement cos ∅
W = 5 × 10 × 500 × cos 90° [ angle between force and displacement ]
W = 50 × 500 × 0 = 0 J
[ As ; Collie moves forward displacement is in forward direction and the load on his head has gravity effect and force downwards so ; angle is 90° and cos 90° is 0 ]
Hope it helps you
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