1.

If forces of magnitudes 6 and 7 units acting in the direction I - 2j +2k and 2i - 2j - k, I + 2j + 2k and -2i + j - 2k respectively act on a particl which is displaced from P (2, -1, -3) to Q (5, -1, 1) then the work done by the forces is

Answer»

4
`-4`
7
`-7`

ANSWER :A


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