Physics 111 PLEASE HELP ASAP
posted by lily .
A 37.5kg child swings in a swing supported by two chains, each 3.05 m long. The tension in each chain at the lowest point is 433 N. the force of the seat on the child is 498.5 N.
b)Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)

They already have told you the answer:
" the force of the seat on the child is 498.5 N"
That is also the force of the child on the seat.