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Question
The work done by a force 2^i−^j+5^k when it displaces the body from a point (3,4,6) to a point (7,2,5) is
The work done by a force 2^i−^j+5^k when it displaces the body from a point (3,4,6) to a point (7,2,5) is
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Solution
The correct option is A 5 units
Given that Force , →F=2^i−^j+5^k NDisplacement vector from (3,4,6) to (7,2,5) , →s=4^i−2^j−^k
Work done by the force , W=→F⋅→s=8+2−5=5 J
Given that
Force , →F=2^i−^j+5^k N
Displacement vector from (3,4,6) to (7,2,5) , →s=4^i−2^j−^k
Work done by the force , W=→F⋅→s=8+2−5=5 J
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