1. The problem statement, all variables and given/known data A mass m is suspended by a light string from the ceiling of a moving car of mass M which is accelerating in the horizontal direction. The string makes an angle θ with the vertical as shown below. The acceleration of the car is: (A) mg/M (B) gsinø (C) g/tanø (D) mg/(m+M) (E) gtanø 2. Relevant equations F=ma 3. The attempt at a solution I have a free body diagram with g pointing downward along the dotted line and F pointing backwards connecting m and the head of g. I just don't know where to go from here.