IUV

Verified answer

1
m1v1+m2*0=m1*0+m2*u2
m1v1=m2*u2
m2=m1*v1/u2=5*9/3 m/s = 15 m/s
2
m1v1+m2*0=(m1+m2)*u
u=m1v1/(m1+m2)=100*0,010/(0,010+0,990) m/s= 1 m/s - ansver a)
(m1+m2)*u^2/2=kx^2/2
x=v*sqrt((m1+m2)/k)=1*sqrt((0,010+0,990)/100) m = 0,1 m = 10 sm - ansver b)