physics energy and friction 1

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A 21.0-kg child on a 3.00-m-long swing is released from rest when the ropes of the swing make an angle of 32.0° with the vertical.

(a) Neglecting friction, find the child’s speed at the lowest position. 

(b) If the actual speed of the child at the lowest position is 2.60 m/s, what is the mechanical energy lost due to friction? 

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