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Home > PC > Chapter 11 > Lesson 11.1.2 > Problem 11-31


A water balloon is tossed from the top of a walkway so that its height above the ground is found by where is measured in feet and is measured in seconds. Approximate the instantaneous velocity of the water balloon when it strikes the ground.

First determine when the ball hits the ground, or when .

The ball hits the ground when seconds.

The velocity is the instantaneous rate of change (IROC). See the Math Notes box in Lesson 9.2.1 for the formula.