Question

Nadia is placing different weights on a spring and measuring the length of the stretched spring. She finds that for a 100 gram weight the length of the stretched spring is 20 cm and for a 300 gram weight the length of the stretched spring is 25cm. What is the unstretched length of the spring?

Answer 1

if 200 grams stretches the spring by 5 cm that means 100 grams stretches it by 2.5 so 20 - 2.5 = 17.5 cm is the unstretched length of spring, hope I helped