Question

after a cannonball is fired into frictionless space, the amount of force needed to keep it going equals​

Answer 1

Answer:

0 N

Explanation:

According to Newton's first law of motion, an object in motion stays in motion until acted upon by an unbalanced force.  With no friction in space to unbalance the cannonball, it will continue to keep going.

Answer 2

The  amount of force needed to keep it going equals​ to 0 N

The following information should be considered:

• As per the Newton's first law of motion, an object in motion stays in motion  till acted upon via an unbalanced force.  
• Having no friction in space to nonbalance the cannonball, it will continue to keep going.

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