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Physics
Physics
Problem
Identify the correct expression for the average power
P
avg
P_{\text{avg}}
P
avg
delivered to a body whose kinetic energy changes from
K
i
K_i
K
i
to
K
f
K_f
K
f
in a time interval
Δ
t
\Delta t
Δ
t
. a)
K
f
+
K
i
2
Δ
t
\dfrac{K_f+K_i}{2\,\Delta t}
2
Δ
t
K
f
+
K
i
b)
K
f
−
K
i
Δ
t
\dfrac{K_f-K_i}{\Delta t}
Δ
t
K
f
−
K
i
c)
K
f
−
K
i
2
Δ
t
\dfrac{K_f-K_i}{2\,\Delta t}
2
Δ
t
K
f
−
K
i
d)
K
f
Δ
t
\dfrac{K_f}{\Delta t}
Δ
t
K
f
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