The values of a for which the points A, ...

The values of `a` for which the points `A, B,` and `C` with position vectors `2hati - hatj + hatk, hati - 3hatj - 5hatk,` and `ahati - 3hatj + hatk`,respectively, are the vertices of a right-angled triangle with `C = pi/2` are

` –2 and –1 `

`–2 and 1 `

`2 and –1 `

`2 and 1`

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MOTION-VECTOR -EXERCISE - 4 ( LEVEL -I)

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