A 25.0 - kg child on a 2.00 - m - long swing is released from restwhen the ropes of the swing make an angle of 30.0° with thevertical. (a) Neglecting friction, find the child’s speed at thelowest position. (b) If the actual speed of the child at the lowestposition is 2.00 m/s, what is the mechanical energy lostdue to friction?

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