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The position vector vecr=5.00thati+(et+f...

The position vector `vecr=5.00thati+(et+ft^(2))hatj` locates a particle as a function of time t. Vector `vecr` is in meters, t is in seconds, and factors e and f are constants. Figure 4-27 gives the angle `theta` of the particle's direction of travel as a function of t (`theta` is measured from the positive x direction). What are (a) e and (b) f, including units?

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(a) 3.50 m/s, (b) `-0.125m//s^(2)`
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