Physics
Shock-absorbers are usually made of steel as it :

Has lower elasticity
Is not brittle
Has no ductile property
Has higher elasticity

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Absence of gravity outside
Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy

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