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Do you have any idea where to start?

Not really.

65km/hr=18.06m/s

1/2(1200kg)(18.06m/s)^2=195698.16J

Small correction there...it should have been:\[195698J=\frac{1}{2}k(2.2m)^2\]

Oh, because it's not the unit that's being squared.

Yep

Looking at that last equation, what do you get for k?

k=80867.01

What's that unit?

Not overly concerned with significant figures in this case, but you make a good point. Thanks!

no problem :)