Below we collect the information in column notation.
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r1(t1=3.0 s) =
|
(
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|
)
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cm
and
r2(t2=16.3 s) =
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(
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)
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cm
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The displacement vector of the particle
Δr is
in the time interval (t1=3.0 s,
t2=16.3 s)
given by
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Δr
= r2
-r1
=
|
(
|
|
)
|
-
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(
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|
)
|
=
|
(
|
|
)
|
=
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(
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)
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cm
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The length Δr
of the displacement vector follows from
Δr = |Δr|
= √( 14.12
+ 5.92 ) = 15.3 cm
Hence, the speed of the particle is given by
v = Δr / Δt = (15.3 cm) / (16.3 - 3.0 s) = 1.15 cm/s
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