In the built-up area of Hellendoorn you explain to a passenger: 'If you accelerate from 50 km/h to 100 km/h, y

Question

In the built-up area of Hellendoorn you explain to a passenger: 'If you accelerate from 50 km/h to 100 km/h, your braking distance becomes exactly 2x as long.'

Accepted Answer

False — False — trap: doubling error. Braking distance at 50 km/h = 12.50 m; at 100 km/h = 50.00 m — that is 4x, not 2x (Book p.126).

In the built-up area of Hellendoorn you explain to a passenger: 'If you accelerate from 50 km/h to 100 km/h, your braking distance becomes exactly 2x as long.'

Correct answer

Explanation