A500 kilogram marlin and a 20 kilogram salmon are swimming at the same velocity. how does the momentum of the two fish compare?

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Below are the choices that can be found from other sources:

A. The marlin has more momentum. 

B. The salmon has more momentum. 

C. Both have the same momentum. 

D. Both have no momentum.

Velocity is speed. Momentum is the product of velocity and mass. Because the Marlin has a much greater mass that means that it's momentum would also be greater. 

Lets look at this. momentum = mass x velocity 

lets say that velocity for both fish is at 2 meters per second 
Marlin : momentum = 500 x 2 = 1000 
Salmon : momentum = 20 x 2 = 40 

Therefore the answer is A

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

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