The distance a spring stretches varies directly as the amount of weight hanging on it.

The distance a spring stretches varies directly as the amount of weight that is hanging on it. A weight of 2.5 pounds stretches a spring 18 inches. Find the stretch of the spring when a weight of 6.4 pounds is hanging on it.
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1 Answer

y=Kx

Distance varies directly with weight therefore, y=distance and x=weight

18=K2.5

k=36/5

y=(36/5)(6.4)

y=46.08 in when weight is 6.4 pounds
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