问两道英文物理题.1、An 819 N bungee jumper falls from a bridge that i

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问两道英文物理题.
1、An 819 N bungee jumper falls from a bridge that is 674 x 10-1 m high. The force constant of the bungee cord is 1.50 x 101 N/m, and its unstretched length is 7 m. How far above the ground is the jumper, when he reaches a state of equilibrium? Express your answer in m, to three significant figures.
2、A rock is dropped from the top of a 79 m high cliff at the same instant that a ball is thrown horizontally with a velocity of 13 m/s off the same cliff. Neglecting air resistance, how much larger is the magnitude of the final velocity of the ball compared its initial velocity? Express your answer in m/s, to two significant figures.
麻烦给一下过程,谢谢～

1)
桥高=67.4m
人重=819N
刚度=15N/m
不可拉伸长度=7
拉伸长度=819/15 (m)
平衡时距离地面高度=
67.4m（桥高）-819N（人重）÷15N/m（刚度）-7（不可拉伸长度）=5.8m
2)石头堕落时间t
h=0.5gt²
79=0.5*10*t²
t=4.000s
球的垂直速度v1
v1=g*t=40.000m/s
水平速度为v0=13m/s
和速度为二者平方和开根号.
V=42.059m/s

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