### What is the mass of the planet in kilograms

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Your spaceship lands on an unknown planet. To determine the characteristics of this planet, you drop a 1.20 kg wrench from 5.00 m above the ground and measure that it hits the ground 0.811 s later. You also do enough surveying to determine that the circumference of the planet is 6.40×104 km . What is the mass of the planet, in kilograms? Express the planet’s mass in terms of the earth’s mass.

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