A drone of mass 3 kg is operating in a test facility. Initially, the drone is moving with a velocity of (4i+7j) m s−1(4\mathbf{i} + 7\mathbf{j})\text{ m s}^{-1}(4i+7j) m s−1. A constant wind force of (6i−9j) N(6\mathbf{i} - 9\mathbf{j})\text{ N}(6i−9j) N acts on the drone for a duration of 4 s.
Find the speed of the drone at the end of this 4 s interval, assuming no other forces act on it.
14.4 m s−114.4\text{ m s}^{-1}14.4 m s−1
13.0 m s−113.0\text{ m s}^{-1}13.0 m s−1
19.4 m s−119.4\text{ m s}^{-1}19.4 m s−1
40.3 m s−140.3\text{ m s}^{-1}40.3 m s−1