Suppose the wind speed increases from 8 km/h to 40 km/h. Which of the following expresses the factor by which the force of the wind will have increased?
A)2
B)4
C)5
D)25

Question

Quizplus · Accepted Answer

The force exerted by the wind on an object is proportional to the square of the wind speed. Therefore, if the wind speed increases from 8 km/h to 40 km/h, the factor by which the force increases is (40/8)^2 = 5^2 = 25.

Suppose the Wind Speed Increases from 8 Km/h to 40