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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 +10 m/s and measures a time of 18.6 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to gravity on this planet? (Indicate direction by the sign of the acceleration.)
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Time to go up = time to come down = 18.6/2=9.3s
moving up
v=vi+gt
at the higher point:
v=0 so
g=-vi/t=-10/9.3=-1.075m/s^2
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