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 6 feet above the lake's surface, how far from Lisa's hand is the rock 4
seconds after it hits the surface?
A

Answer 1

5 feet

Explanation:

1 second =-3 inches what of

4 seconds=?

-3×4÷1=-12 inches

-12 inches =-1 foot

6 feet + (-1) foot= 5 feet