Posted by **janie** on Monday, May 31, 2010 at 9:41am.

An astronaut exploring a distant solar system lands on an unnamed planet with a radius of 2520 km. When the astronaut jumps upward with an initial speed of 2.94 m/s, she rises to a height of 0.83 m. What is the mass of the planet?

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**drwls**, Monday, May 31, 2010 at 10:19am
Calculate the value of the acceleration of gravity "g" on that planet using

V = sqrt(2gH), which leads to

g = V^2/(2H)

Then use g = GM/R^2 to solve for the planet mass, M. G is the universal constant of gravity and R is the planet's radius

- physics -
**janie**, Monday, May 31, 2010 at 10:25am
unfortunately those calculations didn't work, its saying my answer varies significantally

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