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an astronaut on a distant planet wants to determine its acceleration due to gravity . the...

an astronaut on a distant planet wants to determine its acceleration due to gravity . the astrount throws a rock straight up with a velocity of 13.1m/s and measures a time of 20.1 s before the rock returns to his hand . what is the acceleration due to gravity on this planet . ( enter the magnitude of the acceleration and then select the direction )
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