If the vectors , and are coplanar, then the value of is
2
- 1
1
- 2
22.
If , , then anle between is
23.
If the vectors , and are three non-coplanar vectors and , then the value of abc is
0
1
2
- 1
24.
Let , and be three vectors. A vector in the plane of whose projection on is magnitude , is
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25.
If the constant forces and -i^+2j^-k^act 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