At a height of h meters, you can see V kilometers to the horizon. These numbers are related by the equation V=3.5sqrt(h). A person can see 392 km to the horizon from an airplane window. How high is the airplane? (How many meters high?)

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maestro2k1Lv10

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a physics student stands at the top of a hill that has anelevation of 56 meters. He throws a rock and it goes up into theair and then falls back past him and lands on the ground below. Thepath of the rock can be modeled by the equation y=-0.04x^2+1.3x+56where x is the horizontal distance in meters from the startingpoint on top of the hill and y is the height in meters of the rockabove the ground.

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