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Math·Advanced Math·Nonlinear functions

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The function $f(x)=-x(x-401)$, where $0\le x\le 401$, gives the speed, in meters per second, of a particle $x$ seconds after it started traveling. If the function $f$ is graphed in the xy-plane, where $y=f(x)$, which statement is the best interpretation of the point $(1,400)$ on the graph?

A

The particle’s speed was 400 meters per second 1 second after it started traveling.

B

The particle’s initial speed was 400 meters per second when it started traveling.

C

The particle’s speed was 1 meter per second 400 seconds after it started traveling.

D

The particle’s speed increased by 400 meters per second each second after it started traveling.