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A planar closed kinematic chain is formed with rigid links $PQ$ = $2.0$ $m$, $QR$ = $3.0$ $m$, $RS$ = $2.5$ $m$ and $SP$ = $2.7$ $m$ with all revolute joints. The link to be fixed to obtain a double rocker (rockerrocker) mechanism is

  1. $PQ$
  2. $QR$
  3. $RS$
  4. $SP$
in Applied Mechanics and Design 1.4k points 4 7 17
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