A particle moves in 
plane. The position vector of particle at any time 
is 
. The rate of change of 
at time 
. (where 
is the angle which its velocity vector makes with positive x-axis) is :
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Differentiating with respect to time we get,
or 
or 
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