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1.
F1/F2=kx1/10kx2
120/F2=0.02/10.1
F2=120/0.002
F2=60000
2.
F1/F2=x1/x2
200/150=4/x2
x2=4x150/200
x2= 3mm
3.
F=kx
F= 30000x0.15
F=4500