5.170kg+4.20kg calculate this for me with the correct number of significant figures

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

gravitational energy

electrical energy

kinetic energy

ligh energy

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.