Question: On an alien planet where g = 4 m / s ^ 2 , when you drop a pebble from a height, H , it

On an alien planet where g

= 4

/

^2,

when you drop a pebble from a height, H

,

it reaches the ground with a speed V if there is no air resistance. From what height should you drop it so it will reach the ground with twice the speed?

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