Choice 'b' is one possible way to state
Newton's second law of motion.
The other choices are meaningless.
Force = mass x acceleration
force = 2500kg x (20m/s / 10m/s)
force = 2500kg x 2m/s^2
force = 5000kg m/s^2 = 5kN
i hope this is right (^^)
The simple answer would be; closeness to the equator combined with general climate.
