1. The problem statement, all variables and given/known data A motorbike with the velocity 40km/h is able to stop at a distance, D, when it brakes with maximal deacceleration. At what distance will a car with a velocity of 60 km/h stop? 2. Relevant equations . 3. The attempt at a solution I was trying to solve it through regular equations such as at^2=distance, but there seems to be too many unknowns. Any ideas?