Force of package B on package A sliding down a ramp

[nukeman]

Homework Statement

The question asks me: Determine the force of package B on Package A.

Now package A and package B are sliding down a ramp together, so they have the exact same acceleration. The acceleration of the system is 1.8 m/s^2 and the mass of package B is 10kg

So, is it simply F = ma

F = (10kg)(1.8) = 18 N ?

Homework Equations

The Attempt at a Solution

 

[SammyS]

What is the problem you are working on, exactly as it was stated to you?

 

[nukeman]

C is the question I am trying to solve.

 

[SammyS]

What did you use as the frictional force for the system?

How did you find it?

 

[Doc Al]

Please do not create multiple threads on the same problem. You already have a thread on this topic: https://www.physicsforums.com/showthread.php?t=539210

(And please reduce the size of your images!)