Answer:
Her angular speed (in rev/s) when her arms and one leg open outward is
Explanation:
Initial moment of inertia when arms and legs in is
Final moment of inertia when her arms and on leg open outward,
Initial angular speed
Let the final angular speed be
Since external torque on her is zero so we can apply conservation of angular momentum
=>
=>
Thus her angular speed (in rev/s) when her arms and one leg open outward is