Calculate the net work done to accelerate a 1500 kg car from 10m/s to 20m\s

There are two ways to do this one.
In due consideration of 5 points, I have decided
to do it the easy way.

Kinetic energy = (1/2) (mass) (speed²)

The car's KE at the slower speed = (1/2 mass) x (10²)

                                                     =     75,000 joules .

The car's KE at the faster speed =  (1/2 mass) x (20²)

                                                     =    300,000 joules .

The difference in kinetic energy between
the slower and faster speeds =

                                       (300,000  -  75,000) = 225,000 joules.

THAT's the work that had to be done in order to accelerate
the car to double the original speed.

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative.