A model drone of mass 1.2 kg is launched vertically upwards from rest from the ground. The drone's motor produces a constant vertical upward thrust of 18 N.
Assuming air resistance is negligible and taking g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2, find the distance the drone has risen at t=4 st = 4\text{ s}t=4 s.
41.6 m41.6\text{ m}41.6 m
83.2 m83.2\text{ m}83.2 m
120 m120\text{ m}120 m
198.4 m198.4\text{ m}198.4 m