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

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

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The surface of ice is smooth
Ice is cold

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