D.to bring light together
The answer is A. Friction
hope this helps :)
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.
Answer:
time machine popularized the concept of time travel by mechanical means. Yes a long time ago, mahal