A nucleus at rest splits into two nuclear parts having radii in the ratio 1 : 2. Their velocities are in the ratio
4 : 1
8 : 1
2 : 1
6 : 1
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A force F acting on an object varies with distance $x$ as shown here. The force is in N and $x$ in m. The work done by the force in moving the object from $x$ = 0 to $x$ = 6 m is