You must not drive at excessive speeds. if you double the speed of a car, the force of impact in a crash is
- doubled.
- four times as great.
- five times as great.

Four times as great.

Explanation:

The force of impact is given by the impulse

Impulse is the change in momentum of an object

u = Initial velocity of the car

v = Final velocity of the car = 0

m = Mass of the car

When velocity is four times greater

So, if velocity is increased 4 times the momentum will increase four times thus increasing the force of impact by four times.

panem is a communist totalitarian dictatorship where all the resources and how they are allocated belongs to the capitol. the districts exist only to provide goods and services for the capital and most of the citizens live in poverty. it is a police state where the "peacekeepers" use force and threats to keep the people under control. dissent is outlawed and those who disobey the law are executed, flogged, or turned into avoxes. the games are another means in which the ruling elite in the capitol exert their power over the districts. when reading the books i drew parallels between panem and the soviet union and north korea. in no way is panem capitalist. the people in the capitol are wealthy but the majority of them are involved in the government somehow. it was the same way in the former soviet union where bigwigs in the communist party and high ranking government officials were given access to goods, services, medical treatments not available to the general public. if you think panem has a capitalist economy you need to brush up on your economics.  

which sentences ? that question is incomplete