1. The problem statement, all variables and given/known data A 15,000 kg helicopter lifts a 4500 kg truck with an upward acceleration of 1.4 m/s2. Calculate (a) the net upward force on the helicopter blades from the air and (b) the tension in the cable between helicopter and truck. 2. Relevant equations F=ma F = (m1+m2)a 3. The attempt at a solution I do not know how to even begin. Calculating the net upward force, I understand that an upward acceleration is given and that can be simply plugged into F=ma, however, what about gravity?