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An astronaut standing on a new planet wants to find the mass of the planet. His...

An astronaut standing on a new planet wants to find the mass of the planet. His friend in the orbiting space shuttle tells him the radius of the planet is 2900 m. When he drops a rock from the height of 1.5 m it takes 2.9 seconds to hit the ground. What is the mass of the planet. I keep getting 4.5 *10^22 and idk why it is wrong.
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Solukan: The Cravity on the surface of a planet = cm R 69 - Gravitation constant = 6-674x10 M = mass of planet R = Radius =

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