Wonder Woman and Superman fly to an altitude of 1690 km carrying between them a

Question

Wonder Woman and Superman fly to an altitude of 1690 km carrying between them a chest of jewels. They accidently drop the chest and it falls into the ocean. At what speed does the chest impact the surface of the water? Ignore air resistance. The radius and mass of the Earth are 6370 km and 5.98x10^24 kg, respectively. (My original answer was 5755.35, but the feedback told me I had assumed that the acceleration of gravity is the same at all altitudes and equals its value at earth's surface, but I don't realy understand what that meant. Any help would be great on this one. Thanks!)

Explanation / Answer

we know, s=ut+ 1/2 at

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