The amount of airborne particulate pollution p from a power plant depends on the wind speed s,

Question:

The amount of airborne particulate pollution p from a power plant depends on the wind speed s, among other things, with the relationship between p and s approximated by
p = 25 - 0.01s2
(a) Find the value(s) of s that will make p = 0.
(b) What value of s from part (a) makes sense in the context of this application? What does p = 0 mean in this application?