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A 31.0-kg child on a 1.00-m-long swing is released from rest when the ropes of the swing make an angle of 30.0° with the vertical.

(a) Neglecting friction, find the child's speed at the lowest position.
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. m/s

(b) If the actual speed of the child at the lowest position is 1.40 m/s, what is the mechanical energy lost due to friction?
J

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