Acting with in the system selected & can’t accelerate a body.
For a complete system internal forces are equal & opposite (i.e. obey third law) & thus cancel out.
The work done internal forces for a complete system cancel out.
/wp-content/uploads/2021/04/logo-2.png00kp-web-admin/wp-content/uploads/2021/04/logo-2.pngkp-web-admin2022-01-14 13:42:572022-01-14 13:42:57^Internal force
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