Find out the childs speed at the lowest point
A 23 kg child sits in a swing supported by two chains, each 1.6 m long. The acceleration of gravity is 9.8 m/s2 . If the tension in each chain at the lowest point is 203 N, find the child's speed at the lowest point.
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A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 7.5 cm farther away from the mirror. Find the focal length of the convex mirror.
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