The position vector = (5.40 t + (et + ft2) locates a particle?

Question

The position vector = (5.40 t + (et + ft2) locates a particle as a function of time t. Vector is in meters, t is in seconds, and factors e and f are constants. Figure 4-34 gives the angle of the particle's direction of travel as a function of time ( is measured from the positive direction of the x axis). What are (a) factor e and (b) factor f, including units?
the angle =20 degree

Answer 1

Please provide information missing or describe the drawing in question.