An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length
A)60 cm.
B)70 cm.
C)80 cm.
D)100 cm.
E)120 cm.

Question

Quizplus · Accepted Answer

The spring stretches 10 cm under a force of 100 N, indicating a direct proportionality between force and elongation. Adding another 100-N block doubles the force, thus doubling the elongation to 20 cm, making the total length 70 cm.

An Un-Stretched Hanging Spring Is 50 Cm Long