Physics
Lightning is produced when

Clouds strike against impurities in air and the friction burns up these impurities
Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air

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Physics
Kinetic energy depends on

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

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