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The height of a helicopter above the ground is given by h = 2.60t3, where h...

The height of a helicopter above the ground is given by h = 2.60t3, where h is in meters and t is in seconds. After 2.30 s, the helicopter releases a small mailbag. Assume the upward direction is positive and the downward direction is negative. What is the velocity of the mailbag when it hits the ground?

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