Solve Dynamics Problem: Find Accel. & Net Force

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To solve the dynamics problem involving a 1500N block on a 40-degree ramp with friction, first resolve the gravitational force into its components: W_h = mg sin(40) for the horizontal component and W_v = mg cos(40) for the vertical component. The applied force of 250N acts against the component of weight down the ramp, and friction must also be considered, calculated using the coefficient of friction. The net force can be determined by subtracting the frictional force and the gravitational component down the ramp from the applied force. Finally, use Newton's second law, F_net = ma, to find the acceleration of the block.
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Hi I need soem help on thsi problem

A 1500N block sits at rest on a ramp inclined at 40.0 degrees. The coeffeicients of starting and kinetic friction are 0.100 and there is a force of 250N applied up the ramp. I have to find the acceleration and net force. But how can I find the net force if I can't use sigmaFx= ma?
 
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Try resolving the forces acting on the block parallel and perpendicular to the plane, then you can use the components of each force.
e.g., weight becomes W_h = mgsin40 and W_v = mgcos40 for the horizontal and vertical components respectively.
 
What would I be solving for?
 
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