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Question

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 A 1.50 J
F=5^i+9cos60^i+9sin60^j3^j
F=5^i+92^i+932^j3^j
F=^i2+(9323)^j
s=3^i.
W=F.s=[^i2+(9323)^j].(3^i)=1.5J.

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