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A 38.0-kg child swings in a swing supported by two chains, each 2.96 m long. The tension in each chain at the lowest point is 438 N.

(a) Find the child's speed at the lowest point.
_____________m/s

(b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)
_____________N (upward)

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(a) F(net) = mv^2/r + mg
=>438 x 2 = 38 x v^2/2.96 + 38 x 9.8
=>v = sqrt[{876 - 372.4} x 2.96/38]
=>v = 6.26 m/s

(b) 876 N
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