Problem $4.$

An open tank car as shown travels to the right at a uniform velocity of $4\mathrm{.}5\frac{m}{s}.$ The tank car passes $4$ under a jet of water at $40C$ flowing from a stationary $0\mathrm{.}1$ meter diameter pipe with a velocity of $20\frac{m}{s}.$ What is the force exerted on the tank by the water jet?

$($a$)$ Solve the $x-$direction force if the system was steady.

$($b$)$ Solve the $x-$direction force if the system was unsteady.

The answer to a and b are $1500$ N