Question

The stopping distance d of an automobile is directly proportional to the square of its speed s.

Answer 1

Answer:

192 feet is the stopping distance at 48 mph.

Step-by-step explanation:

Set up the proportion     $\frac{x}{75} =\frac{48^{2} }{30^{2} }$    

x/75 = 2304/900   cross multiply  to get 900x = 172800

172800 ÷ 900 = 192

x = 192