Lf velocity is positive, which would most likely yield a negative acceleration?
A final velocity that is faster than an initial velocity.
A time that is less than a half hour.
An initial velocity that is faster than a final velocity.
A time that is greater than a half hour.

Initial velocity faster than final velocity

Explanation:

Positive acceleration will increase velocity and negative acceleration will decrease velocity. Therefore a negative acceleration will make the final velocity slower than the original. The time answers don't have anything to do with the velocity and acceleration relationship.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."