Acceleration at incline with friction

[SilentBlade91]

Homework Statement

A block of mass 250 kg is placed at rest onto 5 different inclines. The angle of incline A is
22o,
B is at 22o,
C is at 22o,
D is at 10o, and
E is at 10o.
The inclines are made of different materials, and have coefficients of friction
mkA = 0.3,
mkB = 0.4,
mkC = 0.5,
mkD = 0.2, and
mkE = 0.1.
For each incline, the static friction is only marginally higher than the kinetic friction.
Rank the magnitude of the acceleration of the block on each incline, from smallest to largest. For ties, list answers alphabetically.

Homework Equations

F=ma
Frictional force equation

The Attempt at a Solution

I tried and got these values: A: .945224m/s^2
B: .036584m/s^2
C: -.872056m/s^2
D: -.228472m/s^2
and E: .73664m/s^2

so I tried C,D,B,E,A but it was wrong :-(

 

[Ry122]

Try B again, it doesn't look like you've calculated it correctly.