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Byju's Answer
Standard XII
Physics
Work Energy Theorem Application
A man does ...
Question
A man does
500
J
of work on a
10
k
g
box. If heat loss due to friction is
375
J
. Find out the velocity of the box after the work has been done on it?
A
5
m
/
s
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B
10
m
/
s
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C
12.5
m
/
s
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D
50
m
/
s
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E
100
m
/
s
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Solution
The correct option is
A
5
m
/
s
Initial velocity of the box is zero i.e
u
=
0
m/s
Let the final velocity of the box be
v
.
Friction force does negative work on the box.
Using work-energy theorem :
W
a
l
l
f
o
r
c
e
s
=
Δ
K
.
E
∴
W
m
+
W
f
=
1
2
m
v
2
−
0
OR
500
−
375
=
1
2
×
10
v
2
⟹
v
=
5
m
/
s
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0
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