Accelerating Bus and Projectile!

Classical Mechanics Level 3

A projectile is thrown by a boy inside a bus having an acceleration of $$\dfrac{40}3 \text{ m/s}^2$$. At what angle (measured with the horizontal in degrees) should the boy throw the ball so that it returns back to him i.e., he can catch the ball?

Take $$g=10\text{ m/s}^2$$.

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