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Abaseball is thrown a distance of 20 meters. what is its speed if it takes 0.5 seconds to cover the distance

In a system, when potential energy decreases, then entropy also decreases. true false

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