# Simple kinematics problem

1. May 16, 2012

### jean28

1. The problem statement, all variables and given/known data

Block A weighs 75lbf and the coefficients of static and kinematic friction between A and the plane are both 0.50. Determine the acceleration of A under the action of the 25 lbf force when the velocity at A is (a) 8fps up the plane, (b) 15 fps down the plane. (c) Zero.

2. Relevant equations

Sum of all forces = mass * acceleration

3. The attempt at a solution

I dont know where to start... the box is doing up a plane and it's cosine is 4/5 and its sine is 3/5.

2. May 16, 2012

### HallsofIvy

Staff Emeritus
"Its cosine is 4/5 and its sine is 3/5". What is "its"?? Yes, I understand it is an angle but with the horizontal or vertical?

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