Please Help Me with Physics?

Question

I would appreciate any helpful input on this physics problem. I am really confused on this one. Thanks for any help :)

A planetary probe is designed to drop the vehicles intrument package from a height of 20 meters above the planet's 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 air bags surround the package. The mass of the planet is 0.1045 times that of Earth, and the radius of the planet is 0.5479 that of Earth.

a) Find the acceleration due to gravity at the surface of the planet.

b) Find how long it takes for the instrument package to fall the last 20 meters (in s).

Answer 1

Gravity is proportional to the mass of the planet. I'd say the acceleration on this planet is 0.1045 * 9.81 m/s^2.

For b) use x = 1/2at^2

t = time
a = acceleration due to local gravity

Answer 2

Good first answer. Homework help without doing it all for him. Nice job.