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v
dx
dt
tt
==−
+
30 80
30
2
..
.
in SI units. Thus, the initial speed is
v
i
= 3.0 m/s and the speed at
t
= 4 s is
v
f
= 19 m/s.
The change in kinetic energy for the object of mass
m
= 3.0 kg is therefore
()
22
1
528 J
2
fi
Km
v
v
Δ=
− =
which we round off to two figures and (using the workkinetic energy theorem) conclude
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 Spring '08
 Any
 Physics, Energy, Kinetic Energy, Work

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