اذا اثرت قوة مقدارها 16 ث كجم على جسم لمدة \frac{1}{4} ثانية فان مقدار دفع القوة
على الجسم بوحدة النيوتن ث تساوى ........................
ا- 4.2
ب- 39.2
ج- 49
د-64
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