Answer:
Acceleration: 
Final velocity: 
Explanation:
To calculate the acceleration, you start from the formula:

Thus:

Now that you have the accelration, you can use the this formula to calculate the final speed:

Thus:

Answer:half of shorter Pipe
Explanation:
Fluid is Flowing through two horizontal pipes with pressure difference

Both pipes have same radius
Length of one Pipe is twice of other
Let Longer Pipe be denote by 1 and smaller by 2
From Hagen Poiseuille equation

Where
viscosity of medium
L=length of Pipe
Q=discharge
D=diameter
For longer Pipe
----1
For smaller Pipe
------2
From 1 & 2 we get


volume flow rate of longer pipe is half of smaller pipe
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Answer: The total resistance increases, so the current in the circuit decreases.