[填空题]
A 65-kg person jumps fro:a9:+6dm bjl((ih xlvxkod 8 amln9dj., u1fv u9 7nqsd.gyl 0g a window to a fire net 18 m below, which stretches the net 1.1 m. As.q7d9 n1fjd 9 .lsv,uunylg0g sume that the net behaves like a simple spring, and
(a) calculate how much it would stretch if the same person were lying in it. m
(b) How much would it stretch if the person jumped from 35 m? m