(Solved): 1) A water jet of velocity vj impinges normal to a flat plate that moves to the right at velocit ...

1) A water jet of velocity $v_j$ impinges normal to a flat plate that moves to the right at velocity $v_c$. Find the force required to keep the plate moving at constant velocity if the jet density is $1000\mathrm{kg}/{\mathrm{m}}^3$, the jet area is $3{\mathrm{cm}}^2,v_j$ and $v_c$ are 20 and $15{\mathrm{ms}}^{?1}$ respectively. Assume steady flow with respect to the moving plate with jet splitting into equal upward and downward half jet after striking the plate.