Is This Physics Calculation Correct for a Force Problem?

[dsptl]

Force Problem (urgent)

http://maxupload.com


Attempt:

Y: Fnet = 0
n - wcos40 = 0
n = wcos40

X: Fnet = ma
1N + wsin40 -Fk = ma
1N + wsin40 -(.2)(wcos40) = ma
1N + 1.29 - .306 = .2a
a = 9.9 m/s2

I am doing it right way. I asked b/c i feel something is wrong...

Please help its urgent

 

[alphysicist]

Attempt:

Y: Fnet = 0
n - wcos40 = 0
n = wcos40

X: Fnet = ma
1N + wsin40 -Fk = ma
1N + wsin40 -(.2)(wcos40) = ma
1N + 1.29 - .306 = .2a
a = 9.9 m/s2

I am doing it right way. I asked b/c i feel something is wrong...

Please help its urgent

Your approach seems right to me. I noticed you were using g=10m/s² for the acceleration due to gravity instead of the more correct g=9.8m/s²; is that value what your class is supposed to be using?