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 [tex]-5[/tex] inches per second. If Lisa holds her hand [tex]5[/tex] feet above the lake's surface, how far from Lisa's hand is the rock 4 seconds after it hits the surface?

Question

Celeste1100 · Answer

After 5 seconds, the rock is 20 feet away from Lisa's hand ;

Anonymous · Answer

The rock is 40 inches away from Lisa's hand 4 seconds after it hits the lake's surface. It started 60 inches above the lake and dropped 20 inches in that time. Thus the remaining distance is 40 inches. 
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Answer (2)

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