20 The position of a particle is given by
r = 3.0t i - 2.0t2 j+4.0 k m
where tis in seconds and the coefficients have the proper units
(a) Find the v and a of the particle? (b) What is the magnitude
velocity of the particle at t = 2.0 s ?
Answers
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Answer:
(a)
v
(t)=d
r
/dt
=3.0
i
^
−4.0t
j
^
a
(t)=d
v
(t)/dt
=−4.0
j
^
(b)
v
(2)=3.0
i
^
−8.0
j
^
v(2)=8.54m/s
∠v(2)=tan
−1
(−8/3)=−69.44
∘
with x axis
Explanation:
Attachments:
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