The motion of particle P on the parabolic path shown is defined by the equations ons r = 6t??1 + 4t2 and = tan??1

The motion of particle P on the parabolic path shown is defined by the equations ons r = 6t??1 + 4t2 and θ = tan??1 2t, where r is expressed in feet, θ in radians, and t in seconds. Determine the velocity and acceleration of the particle when

(a) t = 0,

(b) t = 0.5 s.

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