The acceleration of an object is 5.1 m/s2. The acceleration of a 2nd object which is 1/4 the mass and has double the force acting on it would be m/s2.

The sun's gravitational pull is weaker on the planets that are closer to it, i think.

Shania is trying to determine the oldest geologic unit on this map and the reason to why is she unable to do so is that  the units are all the same age.. when there is the same age, there will be no oldest geologic unit and that i cannot be credible.

B? i think so but hope that's right and answers your question