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ΣFy = 0 because it is just moving on a horizontal surface
F_{n}-W=0 \\
F_{n} = W \\
F_{n} = 980N

but since the problem stated that the speed is constant, the acceleration is 0!
P-u_{k}F_{n}=0 \\
P = u_{k}F_{n} \\
P = 0.25*980 = 245 N
Is there a graph needed for that ?
why would you need a graph? do you mean free body diagram?
you should always draw a free body diagram.
How to do the fbd of it ?