Question

The breaking distance of a car is directly proportional to

its speed squared. A car takes 32m to stop when travelling at
12m/s. Calculate the breaking distance when travelling at
18m/s

Answer 1

72 meters

Step-by-step explanation:

Breaking distance is directly proportional to the speed squared.

d = k v²

When v = 12 m/s, d = 32 m.

32 = k (12)²

k = 2/9

d = 2/9 v²

When v = 18 m/s:

d = 2/9 (18)²

d = 72