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A 23.0-kg child on a 4.00-m-long swing is released from rest when the ropes of the...

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Physics

A 23.0-kg child on a 4.00-m-long swing is released from restwhen the ropes of the swing make an angle of 25.0° with thevertical. (a) Neglecting friction, find the child's speed at thelowest position. m/s (b) If the actual speed of the child at thelowest position is 2.40 m/s, what is the mechanical energy lost dueto friction? J

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