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Mathematics
Mathematics
Problem
The distance in kilometres covered by a car after
τ
\tau
τ
hours is
s
(
τ
)
=
0.5
τ
2
+
τ
s(\tau)=0.5\tau^{2}+\tau
s
(
τ
)
=
0.5
τ
2
+
τ
. a. Calculate its speed in metres per second at
τ
=
0.5
h
\tau=0.5\text{ h}
τ
=
0.5
h
(that is, after
30
30
30
minutes).
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