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Find the scalar and vector projection of `veca` on `vecb`. `veca` = `hati+hatj`, `vecb` = `hatj+hatk`

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Scalar projection of `veca` on `vecb`
= `(veca.vecb)/|vecb| = ((hati+hatj).(hatj+hatk))/_hatj+hatk| = 1/sqrt2`
Vector projection of `veca` on `vecb`
= `((veca.vecb)/|vecb|) vecb/|vecb| = 1/sqrt2 (hatj+hatk)/sqrt2 = hatj+hatk/2`
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MBD PUBLICATION-VECTORS-QUESTION BANK
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  9. If (veca + vecb).(veca-vecb) = 0 show that |veca| = |vecb|.

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