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Find the value of lambda so that the vectors veca and vecb are perpendicular to each other. veca = 2hati-hatj-hatk, vecb = lambdahati+hatj+5hatk

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SOLUTION :If `veca` and `vecb` are perpendicular `veca.vecb = 0`
`implies (2hati-hatj-hatk).(lambdahati+hatj+5hatk) = 0`
`2lambda-1-5 = 0`
`implies 2lambda = 6 implies = lambda = 3.


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