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Question
A spring was hung from a hook in the ceiling. A number of different weights were attached to the spring to make it stretch, and the total length of the spring was measured each time is shown in the following table
| Weight (kg) | 2 | 4 | 5 | 8 |
| Length (cm) | 3 | 4 | 4.5 | 6 |
What is the actual length of the spring
Solution
To find the actual length of the spring
Put weight x = 0 in equation (1)
0 – 2y + 4 = 0
⇒ 2y = 4
⇒ y = 2
∴ The actual length of the spring is 2 cm.
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