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Concept Simulation $2\mathrm{.}3$ offers a useful review of the concepts central to this problem. An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of $+24\mathrm{.}8\frac{m}{s}$ and measures a time of $22\mathrm{.}7s$ before the rock returns to his hand. What is the acceleration $($magnitude and direction$)$ due to gravity on this planet? $($ positive $=$ up$,$ negative $=$ down$)$

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