C. Is the da answer to your question!
The speed of an object at rest is 0 m/s. We can use logic to figure this out. Hope this helps!
Answer:
Pushing molecules like a wave.
Explanation:
Planet A;
m = the mass
Let r = the radius
Planet B:
Let M = the mass
The radius is 2r (twice the radius of planet A)
The surface gravitational acceleration of planets A and B (they have the same surface gravity) are

Answer: The mass of planet B is 4m.