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Question

Find the time dependence of the angle α between the vectors w and v where w is the acceleration and v is the velocity.

A
tan13a2bt
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B
tan1a2bt
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C
tan12abt
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D
tan1a3bt
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Solution

The correct option is A tan1a2bt
Velocity =v=drdt=a^i2bt^j
acceleration =w=dvdt=2b^j
Since, direction of acceleration is towards ydirection then the angle made by velocity vector with yaxis is known as angle between two vectors
tanα=a2bt

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