Question

What is the restoring force of a spring with a spring constant of 4a and a stretched displacement of 3b? A. –7 ab B. `-7 a/b ` C. –12 ab D. `-12 a/b`

Answer 1

C. -12 ab

Step-by-step explanation:

The restoring force on a spring is given by Hooke's law:

`F=-kx`

where

k is the spring constant

x is the stretched (or compressed) displacement of the spring

In this problem we have:

k = 4a

x = 3b

Substituting into the equation, we find:

`F=-(4a)(3b) = -12 ab`

And the negative sign means that the direction of the force (negative) is opposite to the direction of the displacement (positive).