If you change the mass of a moving object, you change its ? ?

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Which two particles are found in the center of an atom

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?