Assertion: In circular motion, dot product of velocity vector `(v)` and acceleration vector `(a)` may be positive, negative or zero.
Reason: Dot product of angular velocity vector and linear velocity vector is always zero.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. If Assertion is true, true but the Reason is false.
D. If Assertion is false but the Reason is true.

Answer

B

Explanation

In first figure, `v.a=0`
In second figure, `v.a=` positive and
In third figure, `v.a=` negative
Further, `omega` and `v` are always perpendicular, so
`omega.v=0`