Question

Imagine that the asteroid A that has an escape velocity of 50m/s. If asteroid B has twice the mass and twice the radius it would have an escape velocity _______ the escape velocity of asteroid A

Answer 1

Hint:
Escape velocity
=√(2GM/r)
G=gravitational constant
M=mass
r=radius

When mass is doubled, replace M by 2M, similarly for r.

For further reading, see for example:
http://en.wikipedia.org/wiki/Escape_velocity

Answer 2

25

Answer 3

the same

Answer 4

half