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Question
A body constrained to move along y-axis is subjected to a constant force →F=−^i+2^j+3^kN. The work done by this force in moving the body a distance of 4 m along y-axis is:
A body constrained to move along y-axis is subjected to a constant force →F=−^i+2^j+3^kN. The work done by this force in moving the body a distance of 4 m along y-axis is:
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Solution
The correct option is B 8 J
Here, →F=−^i+2^j+3^kN
As the body moves a distance of 4 m along y-axis,
∴→d=4^jm
Work done by the given force is
W=→F⋅→d=(−^i+2^j+3^kN)⋅(4^jm)=8 J.
Here, →F=−^i+2^j+3^kN
As the body moves a distance of 4 m along y-axis,
∴→d=4^jm
Work done by the given force is
W=→F⋅→d=(−^i+2^j+3^kN)⋅(4^jm)=8 J.
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