You are an astronaut on the surface of a newly discovered

Last updated: 7/10/2022

You are an astronaut on the surface of a newly discovered planet. In an attempt to determine the acceleration due to gravity on this planet, you use a spring-loaded launcher to fire a steel marble straight upward. 1.68 seconds after firing, the marble hits the ground. If the spring-loaded launcher fired the marble with an initial velocity of 11.5 m/s, the magnitude of the acceleration due to gravity on this planet must be m/s².