Question

the distance needed to stop a car varies directly as the square of its speed. it requires 120m to stop a car at 70km/h. what distance is required to stop a car at 80km/h?

Answer 1

137.14m

Explanation:

x=m

y=kph

kx=y

k120=70

k=7/12

7x/12=80

x=960/7