Help with Dynamics

1. The problem statement, all variables and given/known data
A flat-bed truck with a frictionless ramp accelerates forward.


/l (That 35 is the angle, and a 5kg block rests on the hypotenuse)
--- / l
- - /35 l
- ---------------
-----------------
-o-----------0--

The acceleration of the truck is suck that a 5.0kg block is stationary (relative to the ramp). If the rolling coefficient of friction is (mew=0.10) Find the force the engine is exerting on the 12000kg truck.


2. Relevant equations
F=ma, Ffriction=Fnormal*mew


3. The attempt at a solution
I found the block accelerates 9.8m/s^2 downwards and 13.98m/s^2 to the left, ant the total acceration is 17.1m/s^2
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
 
I found the force of friction on the truck (12000*9.8*0.1) to be 11760Netwons.
 
Please help me :'(
 

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