1. The problem statement, all variables and given/known data If a ball is fired upwards on an unknown planet at 17 m/s from a gun being held 32m above the ground, and it takes 20 seconds before the ball hits the ground, what is the magnitude of the planets 'g' value (acceleration)? 2. Relevant equations kinematic eq'ns 3. The attempt at a solution i really don't understand this problem, can someone give me a hint?? how would i find the final position for when the ball is fired up?