w = kav
225 = k(25)(40)
225 = 1000k
k = 9/40
w = 9/40 av
270 = 9/40(40)(v)
270 = 9v
270/9 = v
v = 30 mile per hour
Wind resistance varies jointly as an object's surface area and velocity. If an mile per hour with a surface area of 25 square feet experiences a wind resistance of 225 Newtons, how fast must a car with 40 square feet of the surface area travel in order to experience a wind resistance of 270 Newtons?
1 answer