Tammy 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 -5 inches per second. If Tammy holds her hand 5 feet above the lake’s surface, how far from Tammy’s hand is the rock 4 seconds after it hits the surface?

Respuesta :

Lisa's hand is located twenty-five feet distant from the rock.

This is further explained below.

How far from Tammy’s hand is the rock 4 seconds after it hits the surface?

Generally, If the rock is falling at a rate of 5 inches per second, then you can easily calculate how deep below the surface of the lake it was after 5 seconds by multiplying 5 by 4.

After four seconds, the rock will have dropped -20 inches.

Because Lisa's hand is five feet above the water's surface, we need to add five to the distance between her hand and the rock in order to calculate how far away it is.

After four seconds, Lisa's hand is located twenty-five feet distant from the rock.

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