Answer :
We have that when a cannon fires a cannonball the reaction is the opposite reaction spoken about in newton law
The cannon moving backward
Option C is correct
Newtons third law state that for every action they must be an equal and opposite reaction Therefore
When a cannon fires a cannonball we observe Newton's third law the reaction force notice is the opposite reaction spoken about in newton law
In conclusion
When a cannon fires a cannonball the reaction is the opposite reaction spoken about in newton law
The cannon moving backward
Option C is correct
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