Draw the freebody diagram from point A needed to determine t

Draw the free-body diagram from point A needed to determine the value of h for which the system is in equilibrium. find h. Let the angle at B = 45 degree. The premise of this experimental rocket is that once it engines start it is released from height h and takes off. If the rocket accelerates an initial speed of 21 m/s^2, what is its mass?

a) 17.3N @ 87.1° b) 108.3N