How much work do you do when you lift a 100 N child 0.5 m?

What are similarities and differences between refraction, reflection, diffraction and absorption?

Which levels of government establish and implement educational requirements for minors

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9