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Physics
Physics
Problem
Which of the following expressions gives the instantaneous power
P
P
P
delivered by a constant horizontal force of magnitude
F
F
F
acting on an object that is moving at speed
v
v
v
along the direction of the force? a)
2
F
v
2Fv
2
F
v
b)
F
v
Fv
F
v
c)
−
F
v
-Fv
−
F
v
d)
1
2
F
v
\dfrac12 Fv
2
1
F
v
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