A copper wire of length ℓ is uniformly stretched to 3ℓ. What happens to the resistance of the wire?

Explanation:The resistance of a wire is directly proportional to its length. When the length is tripled then resistance also become three times. If the diameter gets tripled then its resistance will become one ninth of the initial reistance

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."