A car is moving on a plane inclined at $30^{\circ}$ to the horizontal with an acceleration of $10\, {ms}^{-2}$ parallel to the plane upward. A bob is suspended by a string from the roof of the car.The angle in degrees which the string makes with the vertical is ...... . (Take ${g}=10\, {ms}^{-2}$ )
JEE MAIN 2021, Diffcult
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