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Q.

If A = 4N, B = 3N the value of A x B2=A.B2 then

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a

5 N

b

25 N

c

144 N

d

169 N

answer is C.

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Detailed Solution

A = 4N, B = 3N

A¯ x B¯2+A¯.B¯2=A2B2sinθ+A2B2cos2θ

=A2B2(sin2θ+cos2θ)=A2B2=(4)2(3)2

= 16 x 9 = 144N

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If A→ = 4N, B→ = 3N the value of A→ x B→2=A→.B→2 then