A racing car moves along circular track of radius b. The car starts from rest and its speed increases at a constant rate α.

A racing car moves along circular track of radius b. The car starts from rest and its speed increases at a constant rate α. Let the angle between the velocity and the acceleration be θ at time t. Then (cosθ) is

(A) 0

(B) αt²/b

(D) b/(b² +α²t²)^1/2

A racing car moves along circular track of radius b. The car starts from rest and its speed increases at a constant rate α.

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