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Manipal Entrance Test 2017 Physics Paper
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© examsnet.com
Question : 16
Total: 50
The momentum of a body is increased by
25
%
. The kinetic energy is increased by about
25
%
5\%
56
%
38
%
Validate
Solution:
The relation between
K
and
p
is
p
=
√
2
K
m
when increased by
25
%
,
we have
p
′
=
p
+
25
100
p
=
5
p
4
⇒
4
p
5
p
=
√
K
1
K
2
⇒
K
1
K
2
=
16
25
Hence, percentage increase is
=
25
−
16
16
×
100
=
9
16
×
100
=
56.25
%
© examsnet.com
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