Answer: Net force=20N a=F/m=4
The answer is A. Hope this helps I tried my best!
Also B. Water is the solvent is correct
A. Increase until it reaches it's maximum. Sound travels through air and as the amount of air in the jar increases, the loudness or amplitude of the bell increases until it reaches it's maximum at normal air pressure.
B) Fission Reactions
Fission is a reaction or decay in which the nucleus of an atom splits into two or more smaller, lighter nuclei.