David Charleston (from the Steelheart series) gets warped

Last updated: 7/27/2022

David Charleston (from the Steelheart series) gets warped to a distant planet of radius 5.0 x 105 meters. Being the brainiac that he is, he decides to test how massive the planet is by kicking a ball. The ball weighs 0.4 kg, and he kicks the ball (with respect to the ground) at an angle of 45°. He kicks the ball with a speed of 25 m/s. If the ball lands 5.00 seconds later, what is the mass of the planet? Note that this is not on Earth, and as such the acceleration due to gravity will be different.