Domestic cats can hear sound waves with a maximum wavelength of 6 m. What is the frequency of a sound wave with this wavelength? The speed of sound in air is approximately 330 m/s.

The low lands i believe

If its history of, then b) because a) implies only present day (now)

Answerit increases at a steady rate;

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared.