1.

If the constant due to which it is displaced from a point on a particle due to which it is displaced from a point A(4, -3, -2) to a point B (6, 1, -3) then the work done by the forces is

Answer»

10 units
`-10` units
`-15` units
`-9` units

Solution :Resultant FORCE,
`F=(2hati-5hatj+6hatk)+(-hati+2hatj-hatk)=hati-3hatj+5hatk` and displacement
`d=(6hati+hatj-3hatk)-(4hati-3hatj-2hatk)=2hati+4hatj-hatk`
`:.""`Work DONE W `= F* d=( hati-3hatj+5hatk)*(2hati+4hatj-hatk)=-15`
`=-15` units[ NEGLECTING- ve sign]


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