Speed is
a. a measure of how fast something is moving.
b. always measured in terms of a unit of distance divided by a unit of time.
c. the distance covered per unit time.
d. all of the above. e. none of the above.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

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okay, ima .

um it shows links to uh so kinda microsoft website is that were ima go or no? ?