Physics
An athlete runs before long jump to get advantage on

Frictional force
Principle of moments
Inertia of motion
Moment of a force

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth
It rotates at the same speed as the earth around the sun

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