A train is moving along a straight line with a constant acceleration a. A boy standing in the tr...

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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 foward with a speed of \( 10 \mathrm{~m} / \mathrm{s} \), at an angle of \( 60^{\circ} \) to the horizontal. The boy has to move forward
\( \mathrm{P} \) by \( 1.15 \mathrm{~m} \) inside the train to catch the ball back at the initial height. The acceleration of the train, in \( \mathrm{m} / \mathrm{s}^{2} \) is
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