A train is moving along a straight line with a constant acceleration \( a \). A boy standing in ...

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