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AIEEE 2002 Physics Solved Paper
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© examsnet.com
Question : 4
Total: 75
If a body looses half of its velocity on penetrating
3
cm
in a wooden block, then how much will it penetrate more before coming to rest?
1
cm
2
cm
3
cm
4
cm
Validate
Solution:
We know the work energy theorem,
W
=
∆
K
=
F
S
For first penetration, by applying work energy theorem we get,
1
2
m
v
2
−
1
2
m
(
v
2
)
2
=
F
×
3
.
.
.
(
i
)
For second penetration, by applying work energy theorem we get,
1
2
m
(
v
2
)
2
−
0
=
F
×
S
....(ii)
On dividing
(
i
i
)
by
(
i
)
1
∕
4
3
∕
4
=
S
∕
3
∴
S
=
1
cm
© examsnet.com
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