An observer notes that the pitch of a sound is becoming progressively lower. the observer can conclude that the sound is moving

Positrons are spontaneously emitted from the nuclei of

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.