I am stuck on C and D and E, any help would be appreciated!
The speed of the water (which is calculated in B) is 4.43 m/s
For C I think it might be law of conservation of momentum or use the formula P=(1/2)*rho*A*v^3 with P=FV and possibly F=ma?
I think D is just STUVA (s=ut+(1/2)at^2) where...