A JEE - PROBLEM !

A train is moving along a straight line with a constant acceleration ' \(a\) ' . A boy is standing in the train throws a ball forward with a speed of \(10 \text{ m s}^{-1}\) , at an angle of \(60^{\circ}\) to the horizontal . The boy has to move forward by \(1.15 \ m\) inside the train to catch the ball back at the initial height. Find the value of the acceleration '\(a\)' in \(\text{ms}^{-2}\)?

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