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March 27, 2017

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a string can hold up 12 kg without breaking. You tie the string to a 30kg object sitting on ice and use it to pull the object horizontally 22m. Calculate the minimum possible time to complete the task

  • Grade 11 physics - ,

    Assume friction on ice is zero. All the force goes for acceleration.

    Minimum possible time t is such that

    22 m = (a/2)*t^2 with maximum possible a

    Maximum accelaration a is

    a = Fmax/m = (12*9.8 N)/30 kg
    = 3.92 m/s^2

    Now solve for t in the first equation, using that a value.

  • Grade 11 physics - ,

    3.35

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