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Omni-MATH / A ball inside a rectangular container of width 7 and height 12 is launched from…

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problem

A ball inside a rectangular container of width 7 and height 12 is launched from the lower-left vertex of the container. It first strikes the right side of the container after traveling a distance of 53\sqrt{53} (and strikes no other sides between its launch and its impact with the right side). Find the height at which the ball first contacts the right side.
Plain-text mathematical notation (without MathML)
A ball inside a rectangular container of width 7 and height 12 is launched from the lower-left vertex of the container. It first strikes the right side of the container after traveling a distance of √(53) (and strikes no other sides between its launch and its impact with the right side). Find the height at which the ball first contacts the right side.
Original LaTeX notation
A ball inside a rectangular container of width 7 and height 12 is launched from the lower-left vertex of the container. It first strikes the right side of the container after traveling a distance of $\sqrt{53}$ (and strikes no other sides between its launch and its impact with the right side). Find the height at which the ball first contacts the right side.

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