ue ball hits the ground?
19.
The position of a particle is given by r(t) = tfi +31] + 25k where t is in seconds and the
coefficients have the proper units for r to be in metres. (a) Find v(t) and a(t) of the particle. (b)
Find the magnitude and direction of v(t) at t = 2 s.
See Figure, A m
20.
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Answer:
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
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