Water pressurized to (3.5 x 10^5) Pa is flowing at 5.0m/s in a horizontal pipe

which contracts to 1/3 its former area. What are the pressure and velocity of

the water after the contraction ?


(A) 2.5 x 10^5 Pa , 15m/s

(B) 3.0 x 10^5 Pa , 10m/s

(C) 3.0 x 10^5 Pa , 15m/s

(D) 4.5 x 10^5 Pa , 1.5m/s

(E) 5.5 x 10^5 Pa , 1.5m/s


請問是A還是C呀...要怎麼算勒

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