185
Question
A force F=3^i+4^j+^k displaces a body from a point with coordinates (1, 2, 1) to another point with coordinates (2, 0, 3) the work done by the force is (All physical quantities are in SI units).
A force F=3^i+4^j+^k displaces a body from a point with coordinates (1, 2, 1) to another point with coordinates (2, 0, 3) the work done by the force is (All physical quantities are in SI units).
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Solution
The correct option is A - 3J
Displacement vector →s=→r2−→r1==^i−2^j+2^k
Work W=→F.→S(3^i+4^j+^k).(^i−2^j+2^k)
=3−8+2=(−3)j
Displacement vector →s=→r2−→r1==^i−2^j+2^k
Work W=→F.→S(3^i+4^j+^k).(^i−2^j+2^k)
=3−8+2=(−3)j
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