Optional extension A vehicle’s braking distance is directly proportional to the square of its speed.

Question

Optional extension A vehicle’s braking distance is directly proportional to the square of its speed. At speed $v$, the distance is $20$ m. If the speed is reduced by $40\%$, find

Accepted Answer

(a) $7.2$ m (b) $64\%$ decrease.

Braking distance scale law

Braking distance scale law

Solution:

Solution locked