This is a kinematics problem with calculus. We know that we have calculus because the position function has time raised to a given power.
We'll need a diagram showing the relationship between position, velocity, and acceleration.
The position of a particular particle as a function of time is given by r = (9.60t î+ 8.85 ĵ - 1.00t2 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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