The position of a particle moving on a horizontal line is given by s(t)=2t^315t^2+24t5, where s is measured in feet and t in seconds.
a: What is the initial position of the particle?
b: What is the average velocity of the particle on the interval [0,2]?Indicate units of measure
c: Find a formula for the instantaneous velocity of the particle.
d: When is the particle at rest?
e: When is the particle moving to the right? When is it moving to the left?
f: At t=2 seconds, is the particle moving away from the origin or towards the origin?
h: What is the average acceleration of the particle on the interval [0,2]?
i: Find a formula for the instantaneous acceleration of the particle.
j: At t=2 seconds, is the particle slowing down or speeding up?
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2 answers

a) sub in t = 0
b) avg vel = (s(2)  s(0) )/(20) = ...
c) s ' (t) = 6t^2  30t + 24
d) particle is at rest, when velocity = 0 , that is ...
6t^2  30t + 24 = 0
t^2  5t +4 = 0
(t1)(t4) = 0
when t = 1 or when t = 4
f) sub t=2 into the derivative of c)
if it is positive, > to the right
if it is negative, > to the left
e) same steps as b) except use the velocity expression
you do some of them. 👍
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Reiny 
How do you do E on this problem??
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Madds
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