An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

Q: An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

(a) mv3

(b) $\frac{1}{2} m v^2 $

(c) $\frac{1}{2} m^2 v^2 $

(d) $\frac{1}{2} m v^3 $

Ans: (d)