Intial velocity u=3m/s
final velocity v
2
=u
2
+2as=3
2
+(2×2×5)=29 ⟹v=5.3m/s
KE=
2
1
m(v
2
−u
2
)=
2
1
×2×((5.3)
2
−3
2
)=20J
You could use a magnetic generator or you could use hydraulic power
The more viscous a substance, the more difficult it will be to spread out and run quickly, so the more viscous a substance, the narrower the flow. (I am not 100% sure, I have only a little experience with fluid dynamics, but as you asked me to answer there is my best shot!)
