A39-cm-long vertical spring has one end fixed on the floor. placing a 2.2 kg physics textbook on the spring compresses it to a length of 29 cm. what is the spring constant?

To solve this problem we will apply Hooke's law. Which says that the force on a spring is equivalent to the product between the elastic constant and the displacement of the spring.

Here,

k = Spring constant

x = Displacement

Rearranging to find the spring constant,

Spring compresses it to 29 cm so

The force in this case is equivalent to the weight of the spring

Therefore the spring constant is 215.6N/m

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