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there is a window in the floor, and you can see that you re in a...

there is a window in the floor, and you can see that you re in a rocket which has just taken off from the surface of an alien planet. By taking careful measurements out that window you determine that the rocket is accelerating upward at 7.12 m/s^2. When you drop a ball from a height of 1.37 m, it hits the floor 0.218 s later. What is the value of g for the alien world below you?  

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