Aperson on a rocket traveling at 0.47 c (with respect to the earth) observes a meteor come from behind and pass her at a speed she measures as0.47 c.

how fast is the meteor moving with respect to the earth?

The concept to solve this problem is related to the relativistic physics for which the speed of the object in different frames of reference is related. This concept is called Velocity-addition formula

and can be written as,

Where,

u = Velocity of a body within a Lorentz Frame

v = Velocity of a second frame

u'= The transformed velocity of the body within the second frame

c = speed of light

Replacing we have to

Therefore the meteor moving with respect to the Earth to 230'700.000m/s

this is poiselle's equation from fluid mechanic in physics. mech eng

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.