Question: An object moves in a straight line, acted on by air resistance, which is proportional to its velocity; this means its acceleration is a(t) =

An object moves in a straight line, acted on by air resistance, which is proportional to its velocity; this means its acceleration is a(t) = -kv(t). The velocity of the object decreases from 1000 ft/s to 900 ft/s over a distance of 1200 ft. Approximate the time required for this deceleration to occur.

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