Two football linemen push against each other in practice. They do not move, but then lineman B moves forward and lineman A moves backward. Why does this happen?
A. Lineman A pushes with a greater force, causing a net force that acts in his direction.
B. When the lineman push on each other, they cause action-reaction forces that are unequal.
C. Because the lineman push in different directions, the net force is zero.
D. The forces are balanced, but then line B exerts a greater force, causing unbalanced forces.

Dear Student,

In initial case, both are exerting equal force on each other so they do not move. Later on lineman B exerts more force towards lineman A which lead to lineman A moving backward and as lineman B has tendency to exert force so he moves forward. Hence, option D is the correct answer.

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