Why is light-year not related to time? (I just need scientific evidence why it isn't related to time)

A light year is a measure of distance as opposed to a time measurement. This is because a light year is the distance light can travel in the time of a year.

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