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Physics
Physics
Problem
12. A weight lifter lifts a mass
m
m
m
at constant speed to a height
h
h
h
in time
t
t
t
. How much work is done by the weight
lifter?
(A)
m
g
(B)
m
h
(C)
m
g
h
(D)
m
g
h
t
(E)
m
g
h
/
t
\begin{array}{llllll}\text { lifter? } & \text { (A) } m g & \text { (B) } m h & \text { (C) } m g h & \text { (D) } m g h t & \text { (E) } m g h / t\end{array}
lifter?
(A)
m
g
(B)
mh
(C)
m
g
h
(D)
m
g
h
t
(E)
m
g
h
/
t
(A)
m
g
m g
m
g
(B)
m
h
m h
mh
(C)
m
g
h
m g h
m
g
h
(D)
m
g
h
t
m g h t
m
g
h
t
(E)
m
g
h
/
t
m g h / t
m
g
h
/
t
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