What angle will the string make with the vertical?

A light string carrying a small bob of mass 5×102 kg5\times10^{-2}\text{ kg} hangs from the roof of a moving vehicle. The vehicle moves down an incline making an angle of 3030^\circ with the horizontal with a constant acceleration of 3 m/s23\text{ m/s}^2.

To the nearest degree, what angle will the string make with the vertical?

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