If a spring is stretched 5 cm with a force of 15 kg, how far will it stretch if the force is increased to 24 kg?

In order to find the extension of the spring, you will need to use Hooke's Law: force equals the extension of the spring times a constant (F = dk). Thus, 15 kg = 5 cm * k => k = 3. If the force is increased, you will have 24 = d \u00D7\u00A03, or d = 8 cm.