Physics
Gasoline is useful in cars because it has

Chemical potential energy
Kinetic energy
Gravitational potential energy
Electrical potential energy

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Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat
It provides oxygen to a drowning person

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