i'm trying to teach myself how to do this for hours and have come up with very little. here's the problem: An inclined plan making an angle of 45 degress with the horizontal has a frictionless pulley on its top. A 3-kg block(call it B) on the plane is connected to a freely hanging 4-kg block(call it A) by means of a cord passing over the pulley(bascially the 4-kg block is hanging and the 3-kg is on the inclined plane). Find the magnitude and direction of acceleration of the moving system of the two blocks. Coefficient of friction between the block B and incline plane is .6. assume the cord and pulley are massless. any help with this problem would be greatly, greatly appreciated.