While stretching a spring 20 cm past its natural length, it exerts a force of 8 N. What is the spring constant of this spring is 0.4 N / cm, the correct option is B.
The spring constant is used to define the stiffness of the spring, the greater the value of the spring constant stiffer the spring and it is more difficult to stretch the spring.
The mathematical relation for calculating the spring constant is as follows
F = - Kx
where F represents the Force
x represents the amount of stretch in the spring
K represents the value of the spring constant
For given problem
F= 8 N and x = 20 cm
K = F/x
=8/20 N/ cm
=0.4 N / cm
The spring constant for the spring is 0.4 N/ cm
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