A 35.0-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)