(7) [7 points] A quadcopter is programmed to fly parallel to the ground with a position vector as a function of time given by: = t + yt (a) Find expressions for the velocity and acceleration vectors. (b) For = 0.180 m/s, and y = 0.450 m/s, find the time when the quadcopter is flying at an angle of 30 clockwise from the x-axis. (c) What is the magnitude of the acceleration at the time found in (b)?