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An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut...

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 +18.9 m/s and measures a time of 16.1 s 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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Answer #1

total time of flight

h = vt - 0.5 g t^2

0 = 18.9 * 16.1 - 0.5* g * 16.1^2

g = 2.348 m/s^2

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do comment in case any doubt, will reply for sure.. Goodluck

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