Physics
What is the unit of the physical quantity "Jerk"?

Meter second
Meter per second cube
Meter per second square
Meter per second

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Physics
Lightning is produced when

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

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