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AIEEE 2006 Solved Paper
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© examsnet.com
Question : 61
Total: 143
A particle of mass
100
g
is thrown vertically upwards with a speed of
5
m
∕
s
. The work done by the force of gravity during the time the particle goes up is
−
0.5
J
−
1.25
J
1.25
J
0.5
J
Validate
Solution:
Kinetic energy at point of throwing is converted into potential energy of the particle during rise.
K
.
E
=
1
2
m
v
2
=
1
2
×
0.1
×
25
=
1.25
J
W
=
−
m
g
h
=
−
(
1
2
m
v
2
)
=
−
1.25
J
[As we know,
m
g
h
=
1
2
m
v
2
by energy conservation ]
© examsnet.com
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