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[" What is the value of linear velocity,if "b=3hat i-4hat j+hat k" and "dot boldsymbol r=5hat i-6hat j+6hat k],[[" (a) "6hat i+2hat j-3hat k," (b) "-18hat i-13hat j+2hat k],[" (c) "4hat i-13hat j+6hat k," (d) "6hat i-2hat j+8hat k]]

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