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The vectors ` vec(a),vec(b),vec (c )` are such that `vec(a) + vec(b) + vec ( c ) = vec(0)` . If `|vec(a)| = 3 , |vec(b)|= 4 and |vec(c )|= 5 , ` show that` vec(a).vec(b) +vec(b) .vec(c ) + vec (c ) . vec(a) = - 25`

A

1

B

0

C

`-7`

D

7

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The correct Answer is:
C
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MOTION-VECTOR -EXERCISE - 4 ( LEVEL -I)
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  9. If C is the mid-point of AB and P is any point outside AB, then

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  12. ABC is triangle, right angled at A. The resultant of the forces acting...

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