Question 6 10 pts While visiting another planet, an astronaut wants to determine the acceleration of gravity on the planet Gallifrey. She throws a hammer straight up into the air with a velocity of 14.8 m/s. If she catches the hammer at the same height after 3.13 seconds, what is the acceleration of gravity on Gallifrey? (Ignore any air resistance on Gallifrey.) O 9.46 m/s^2 O 4.73 m/s^2 O 0.22 m/s^2 O 7.61 m/s^2