can someone check my work? Somehow I didn't get the right answer:

A sled weighing 3350 N is pulled over snow at a uniform speed by exerting a force of 1200 N. Find the coefficient of friction.

F = m * a

Ff = μ * Fn

1200 N = μ * (3350 N * 9.8 m/s^2)

μ = 1200 N / (3350 N * 9.8 m/s^2 )

μ = 0.0365519

μ = 0.037

Question

can someone check my work? Somehow I didn't get the right answer: 

A sled weighing 3350 N is pulled over snow at a uniform speed by exerting a force of 1200 N. Find the coefficient of friction.
	
	F = m * a 
	
Ff = μ * Fn 

1200 N = μ * (3350 N * 9.8 m/s^2) 

μ = 1200 N / (3350 N * 9.8 m/s^2 )

μ = 0.0365519 

μ = 0.037

anonymous · Answer

the error is that it weights 3350 N, not 3350 Kg. That means that is is "already multiplied by g" . So your passages are correct, just get rid of g ;)