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4. An object is being lifted to the top of building by a light inextensible rope with a tension of 20 N at an acceleration of 1.4 m/s2. Neglecting air resistance, calculate the object’s mass.

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    F = ma = 20 N.
    m*1.4 = 20.
    m = 20 / 1.4 = 14.3 kg.

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