1. The problem statement, all variables and given/known data An astronaut lands on an unknown planet with a radius of 3560 m. When she jumps upward with an initial speed of 3.00m/s she rises to a height of 0.50 m. What is the mass of the planet? 2. Relevant equations vf2 = v02 + 2a[tex]\Delta[/tex]X 3. The attempt at a solution In order to find the acceleration(gravity of the planet in this case) of the astronaut, I used following formula. vf2 = v02 + 2a[tex]\Delta[/tex]X If I solve for 'a', then I get a = (vf2-vo2) / 2[tex]\Delta[/tex]X I pluged in the numbers, a = (9m/s) / 2(0.5 m) = 9 m/s2 which doesn't make sense because the radius of the planet is only 3560 m. please help me what to do next.