58. 15.5
بما أن الجسم يتحرك بسرعة ثابتة، فإن محصلة القوى المؤثرة على الجسم تساوي صفرًا، وبالتالي فإن القوة الخارجية تؤثر عكس اتجاه الحقل إلى اليمين، عموديًا على الحركة.
نرسم مخططًا للقوى المؤثرة على الجسم:

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