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

Question

( A ) $\frac{1}{2}mv^3$
( B ) $\frac{1}{2}mv^2$
( C ) $\frac{1}{2}m^2v^2$
( D ) $mv^3$