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A pin jointed uniform rigid rod of weight $W$ and length $L$ is supported horizontally by an external force $F$ as shown in the figure below. The force $F$ is suddenly removed. At the instant of force removal, the magnitude of vertical reaction developed at the support is

  1. $\text{zero}$
  2. $W/4$
  3. $W/2$
  4. $W$
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