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The length of the line segment whose pro...

The length of the line segment whose projection on the coordinate axes are of magnitudes 12,4,3 is (1) 13 (2) 17 (3) 19 (4) 21

Text Solution

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projectile`veca` on `vecb`=`(veca*vecb)/|vecb|`
`veca=a_!hati+a_2hatj+ahatk`
`a_1hatihatj=a_1`
`a_1=12`
`a_2hatihatj=a_2`
`a_2=4`
`a_3=3`
`veca=12hati+4hatj+3hatk`
...
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