a) The mass of the ship is 
b) The ship has a larger momentum than the shell
Explanation:
a)
The momentum of an object is given by:

where
m is the mass of the object
v is its velocity
For the ship in this problem, we have
is the momentum
is the velocity
Solving for m, we find the mass of the ship:

b)
The momentum of the artillery shell is given by

where
m is its mass
v is its velocity
For the shell in this problem,
m = 1100 kg
v = 1200 m/s
Substituting,

So, we see that the ship has a larger momentum.
Learn more about momentum:
brainly.com/question/7973509
brainly.com/question/6573742
brainly.com/question/2370982
brainly.com/question/9484203
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