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سيارة وزنها 6 ث طن تصعد منحدرا  يميل على الافقى بزاوية   قياسها 30 متحركة 

فى خط مستقيم , فاذا كانت  المقاومة  لحركة السيارة تساوى 194 نيوتن لكل طن 

من كتلة  السيارة , فان  مقدار  قوة محرك السيارة يساوى ............................ ث كجم 

ا- 4764

ب- 6180

ج- 3294

د-3180

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