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A body with a mass of 10 kg is placed on a smooth surface. It is pulled by a spring balance and the acceleration is 5 m/s². What should the reading on the spring balance be?

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  1. Apply F=ma (Newton's second law)
    where
    F=force (in N)
    m=mass in kg
    a=acceleration in m/s²
    so
    F=ma=10kg * 5 m/s²=50 N

    If the spring balance is graduated in kilograms (mass), which is the usual case, then it will show
    ma/g=5 kg (approximately).

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