The expression 0.01e+0.003e^2 the thickness in millimeters (mm) of the insulation needed for a high voltage cable. e is the number of kilovolts carried by the cable. what thickness of insulation material is needed for 7 kilovolt cable?
a)0.091mm
b)1.54mm
c)0.217mm
d)0.847mm

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2