Question: On the planet Newtonia a simple pendulum having a bob with mass 1.25 kg and a length of 185.0 cm takes 1.42 s, when released

On the planet Newtonia a simple pendulum having a bob with mass 1.25 kg and a length of 185.0 cm takes 1.42 s, when released from rest, to swing through an angle of 12.5°, where it again has zero speed. The circumference of Newtonia is measured to be 51,400 km. What is the mass of the planet Newtonia?

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