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As per your syllabus, eqn 6.11, the equation of motion of the centre of mass of a system of particles is which?
AM A_cm = F_ext (total external force)
BM A_cm = F_total (sum of all)
CM A_cm = F_int (total internal force)
DM A_cm = 0 always
Answer & Solution
Correct answer: A. M A_cm = F_ext (total external force)
syllabus eqn 6.11: total external force = total mass × acceleration of CM.
Internal forces cancel in pairs (Newton's 3rd law).
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