HOOKE'S LAW

2 marks · Easy

A spring is 12.0 cm long without any load. A force of 5.0 N extends it to 13.5 cm. Calculate the spring's extension produced by this force. Give your answer in cm.

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1.5 cm (±0.1)

Also accept: 1.5

Common mistakes: Incorrectly subtracting initial length from force value.

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Marking points

M1 · 1 mark · Correctly uses formula extension = (stretched length - original length).

A1 · 1 mark · Gives correct value 1.5 cm with appropriate unit.

Worked solution