A starship lands on a planet of mass 61023 kg an astronaut, Ask an Expert

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A starship lands on a planet of mass 6*10^23 kg. An astronaut throws a rock of mass 9.5 kg up from the ground at 17 m/s. The maximum height reached by the rock is 100 m.

a) what is the gravitational acceleration on the rock?

b) what is the radius of the planet?

c) what is the escape velocity of the planet?

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