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..
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جسيم يتحرك بسرعة منتظمة  فى خط مستقيم تحت تاثير القوتين  \overline{ق1}\ \ =\ ا\ \overline{س\ }\ -\ 3\overline{ص}\ +\ \overline{ع\ }\ 4\ ,\ 2\overline{ق}\ =\ 6\ \overline{س}\ +\ ب\ \overline{ص}\ -\ جـ\ \overline{ع}   فان ا + ب + جـ = .......................

ا- 1

ب - -1

ج- 2

د- 7

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