Question

Lisa is standing on a dock beside a lake. She drops a rock from her hand into the lake. After the rock hits the surface of the lake, the rock's distance from the lake's surface changes at a rate of −3 inches per second. If Lisa holds her hand 7 feet above the lake's surface, how far from Lisa's hand is the rock 8 seconds after it hits the surface? the rock is ? inches away from Lisa's hand

Answer 1

Answer:

The distance between Lisa hand and rock is 88 inches.

Step-by-step explanation:

Consider the provided information. We need to find how far from Lisa's hand is the rock 8 seconds after it hits the surface. The rock's distance from the lake's surface changes at a rate of −2 inches per second. In 8 second the distance of rock and surface will be: Distance = 8×(2) = 16 inches below the surface of lake. We took positive 2 because distance can't be a negative number.

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