A particle is moving with initial veloci...

A particle is moving with initial velocity `bar(u)=hati-hatj+hatk`. What should be its acceleration so that it can remain moving in the same straight line?

`vec(a)=2hati-2hatj+2hatk`

`vec(a)=-2hati+2hatj+2hatk`

`vec(a)=3hati+3hatj+3hatk`

`vec(a)=1hati-1hatj`

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The correct Answer is:

To move in a straight line
`vec(epsilon)||vec(u)`

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