What type of chemical reaction does this equation represent?

Ag2S + KCN --> AgCN + K2S

Can you guys me with question no. 5!

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here