The kinetic energy of an object is given by

where m is the mass of the object and v its velocity.
For the car in the problem,

and

, so the kinetic energy of the car is

and as we can see, yes, the answer depends on the car's mass.
Answer:
Explanation:
The weaker force is pulling to direction East(450 newton)
the net force is (500-450=50 newton) and will move toward west ( in 500 newton direction)
You can't keep cutting because the object will be gone
We know, speed = Distance / Time
d = 384,750 Km
t = 2 days, 19.5 hours = 48+19.5 = 67.5 hour
Substitute their values,
s = 384,750 / 67.5
s = 5700 Km/h
In short, Your Answer would be 5700 Km/h
Hope this helps!