Physics
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

Magnetic properties of the ship's material
Earth's gravitational force
Newton's third law of motion
Bernoulli's principle

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Physics
Kinetic energy depends on

The velocity or speed of the moving body.
Both mass and velocity of the moving body
The mass of the moving body
The pressure of the moving body

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