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If |vecA| = 4 and is constant. The value...

If `|vecA| = 4` and is constant. The value of `vec, (dvecA)/(dt)` can be :

A

1

B

0

C

negative

D

infinite

Text Solution

Verified by Experts

The correct Answer is:
B
If`|vecA|=4`………..
Since `|vecA|=4`
`implies |vecA|^(2)=16 implies vecA.vecA = 16`
`"Diff.w.r.t. 't'"`
`vecA.(dvecA)/(dt)+(dvecA)/(dt)vecA = 0`
`implies vecA. (dvecA)/(dt) = 0`
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