Standard Science Primary 6 Interactions

A 10cm spring extends to 14cm when a 40g weight is added. What is the extension if a 20g weight is used instead?

A 2 cm
B 12 cm
C 4 cm
D 7 cm
Show Worked Solution

Worked Solution

Step 1: Extension for 40g = 14cm - 10cm = 4cm. Step [2-9]: 20g is half of 40g. Step [2-9]: Since extension is proportional to weight, extension for 20g = 4cm / 2 = 2cm.

Correct answer: 2 cm

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