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KEAM 2018 Physics and Chemistry Paper
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© examsnet.com
Question : 13
Total: 120
Some of the following equations are kinetic equations, where the symbols have their usual meaning. The work-energy theorem is represented by
v
=
u
+
a
t
s
=
u
t
s
=
u
t
+
1
2
a
t
2
v
2
=
u
2
2
+
a
s
v
2
=
u
2
+
2
a
s
Validate
Solution:
According work-energy theorem,
net work
=
change in kinetic energy = final KE - initial KE
So
F
⋅
s
=
1
2
m
v
2
−
1
2
m
u
2
⇒
m
a
⋅
s
=
1
2
m
v
2
−
1
2
m
u
2
⇒
v
2
−
u
2
=
2
a
s
⇒
v
2
=
u
2
+
2
a
s
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