The strange planet Zztop has mass 8.00 x 1025 kg. Zztop is spherical and has uniform density. If an object of mass 0.600 kg is projected straight upward from the surface of Zztop with an initial speed of 16.0 m/s, it returns to the surface in a time of 8.00 s after it is projected upward. What is the radius of planet Zztop?
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