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A pointer attached to a spring balance points to 21.5 cm on a scale when no weight is suspended from it. When a mass of 165g is hanged from it, it points 38.0 cm.

  1. Determine its spring constant.   
  2. What would be the extension if two similar springs A and B in (a) above are used as shown below. 
    Similar springs

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  1. e=38.0−21.5=16.5m=0.165m
    k=  1.65N        =10Nm−1
         0.165m
  2. K2= 10×10  5N/M
            10+10
    ∴et= F   = 1.65N
            KT    5N/M
    =0.33m
    OR
    e=2×0.165m
    =0.33m
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