Figure shows three forces applied to a trunk that moves leftward by 3 m over a smooth floor. The force magnitudes are F1=5N,F2=9N, and F3=3N. The net work done on the trunk by the three forces
A
1.50 J
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B
2.40 J
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C
3.00 J
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D
6.00 J
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Solution
The correct option is A1.50 J →F=−5^i+9cos60∘^i+9sin60∘^j−3^j →F=−5^i+92^i+9√32^j−3^j →F=−^i2+(9√32−3)^j →s=−3^i. W=→F.→s=[−^i2+(9√32−3)^j].(−3^i)=1.5J.