Accuracy is how a measurement is to the expected value'

vapour or gas assuming atmospheriv pressure

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2