The position of a particular particle as a function of time is given by r = (9.60t **î**+ 8.85 **ĵ** - 1.00t^{2} **k̂**) m, where t is in seconds.

(a) What is the average velocity of the particle between t=1.00 s and t=3.00 s?

(b) What is the magnitude of the instantaneous velocity at 4.00 s ?

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