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Class 11 NEET Physics Work, Energy and Power Questions
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© examsnet.com
Question : 59
Total: 89
A bomb of mass
30
k
g
at rest explodes into two pieces of masses
18
k
g
and
12
k
g
. The velocity of
18
k
g
mass is
6
m
s
−
1
.
The kinetic energy of the other mass is
(2005)
324 J
486 J
256 J
524 J.
Validate
Solution:
According to law of conservation of angular momentum,
30
×
0
=
18
×
6
+
12
×
v
⇒
−
108
=
12
v
⇒
v
=
−
9
m
∕
s
Negative sign indicates that both fragments move in opposite direction.
K.E. of
1
2
k
g
=
1
2
m
v
2
=
1
2
×
12
×
81
=
486
J
© examsnet.com
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