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A 22 kg dolphin moving in the positive direction decelerates from 12.5 to 8.5 m/s in 2.5 s to join another dolphin in play. What

A 22 kg dolphin moving in the positive direction decelerates from 12.5 to 8.5 m/s in 2.5 s to join another dolphin in play.

What average force, in newtons, was exerted to slow him if he was moving horizontally? (The gravitational force is balanced by the buoyant force of the water.)

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