The following statements describe parts of a short delivery drone journey: Part A: The drone accelerates at a constant rate from 0 m/s0\text{ m/s}0 m/s to 15 m/s15\text{ m/s}15 m/s in 30 s30\text{ s}30 s. Part B: The drone travels at a constant velocity for 180 s180\text{ s}180 s. Part C: The drone decelerates at a constant rate coming to a stop in 40 s40\text{ s}40 s.
During which part of the journey is the resultant force on the drone zero?
A velocity-time graph of this journey is plotted with time in seconds on the horizontal axis and velocity in metres per second on the vertical axis. The line for Part A starts at (0,0)(0, 0)(0,0) and ends at (30,15)(30, 15)(30,15). Describe the lines that must be drawn to complete the graph for Part B and Part C, specifying their start and end coordinates.
Write down the equation which links acceleration, change in velocity, and time taken.
Another drone accelerates at 1.40 m/s21.40\text{ m/s}^21.40 m/s2 for 15.0 s15.0\text{ s}15.0 s. Calculate the increase in velocity of this drone.