The position vector 7 = (3.50t)î + (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. The figure 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? (a) Number i (b) Number i 20° 0° -20° 10 t (s) Units Units 20

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Projectile Motion