A 27.0-kg child on a 1.00-m-long swing is released from rest when the ropes of the swing make an angle of 25.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. m/s (b) If the actual speed of the child at the lowest position is 1.20 m/s, what is the mechanical energy lost due to friction? J