1. The problem statement, all variables and given/known data A man standing in an elevator that is moving with a constant acceleration holds a 3-kg block B between two other blocks in such a way that the motion of B relative to A and C is impending. Knowing that the coefficients of friction between all surfaces are μs = 0.30 and μk = 0.25, determine (a) the acceleration of the elevator if it is moving upward and each of the forces exerted by the man on blocks A and C has a horizontal component equal to twice the weight of B, (b) the horizontal components of the forces exerted by the man on blocks A and C if the acceleration of the elevator is 2.0 m/s2 downward 2. Relevant equations newton's 2nd law sum of the forces in x = 0 sum of the forces in y = ma 3. The attempt at a solution I am stuck on part a. I tried drawing a FBD of block B to find the acceleration of the elevator but it didn't work out.