$-$ Mark: $20$

$\backslash ($ P$\_\{\backslash$text $\{$roblem $\}\}2\backslash )(6$ points$)$

Water accelerated by a nozale to $\backslash (35\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash )$ strikes the

vertical back surface of a cart moving horizontally at a constant velocity of $\backslash (10\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash )$ in the flow direction. The mass flow rate of water through the stationary nozzle is in all directions in the plowe, the water stream splatters off Determine the force $\backslash ($ F $\backslash )$ plane of the back surface. brakes of the cart to of that needs to be applied by the