If vec a is a vector of magnitude 50 and...

If `vec a` is a vector of magnitude 50 and parallel to `vec b= 6 vec i - 8 vec j- 15/2 vec k` and makes an acute angle with the z-axis then `vec a=`___________.

`23i-32j-30k`

`-24i+32j+30k`

`12i-16j-15k`

none of these

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