You take the same bend near Cauberg first at 30 km/h, then at 60 km/h. How does the centrifugal force at 60 km/h relate to that at 30 km/h?
Twice as large
Four times as large
Explanation
Wrong — trap: quadratic relationship simplified to linear. At 60 km/h the centrifugal force is four times as large as at 30 km/h, not twice (Book p.68).