How can you reverse a physical change?

Which describe reflection? check all that apply. light bounces off a boundary.

=force × distance a. work b. velocity c. pressure d. momentum

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block