Physics
The safest hammers are those with heads that are

Alloy and drop-forged steel
Chiseled and drop forged
Welded and alloyed
Cast steel and chiseled

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Physics
The Hooke's law is valid for

Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve
Entire elastic region of the stress strain curve

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