PHYSICS HELP!! PROBLEMSS!!?

The Mars probe, pathfinder, is designed to drop the instrument package from a height of 20 m aboe the surface after the speed of the probe has been brought to zero by a combination parachute-rocket system at that height. To cushion the landing, giant airbags surround the package . The m of mars is .107 4 times the that of Earth and the radius of Mars .528 2 that of Earth. Find (a) the accerlation, due to gravity at the surface of mars and (b) how long it takes for the instrument package to fall the last 20 meters.