During a test flight in which a 9000-kg helicopter starts from rest at t = 0, the acceleration of its center of mass from t = 0 to t = 10 s is
a = 0.6ti + (1.8 – 0.36t).j (m/s2).
What is the magnitude of the total external force on the helicopter (including its weight) at t = 6 s?
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