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Standard IX
Physics
Potential Energy
Question
A man raises 1 kg wt. to a height of 100 cm and holds it there for 30 minutes. How much work has he performed?
1
×
9.8
J
1
×
9.8
×
30
e
r
g
1
×
9.8
×
30
×
60
J
1
×
9.8
×
30
J
A
1
×
9.8
J
B
1
×
9.8
×
30
×
60
J
C
1
×
9.8
×
30
J
D
1
×
9.8
×
30
e
r
g
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Solution
Verified by Toppr
Given
m
=
1
k
g
h
=
100
c
m
=
1
m
t
=
30
m
i
t
Work dont
W
=
Force
⋅
Displacement
Force apply to lift the mass = Weight of the body=
1
×
9.8
N
From above equation,
W
=
1
×
9.8
×
1
J
W
=
1
×
9.8
J
Option A
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