12. Body A of mass 4m moving with speed u collides
with another body B of mass 2m, at rest. The
collision is head on and elastic in nature. After
the collision the fraction of energy lost by the
colliding body A is:
(2019
8.
a.
b.
9
9
4
C.
d.
9
9
Answers
Answered by
2
Answer:
Fractional loss of KE of colliding body,
KE
ΔKE
=
(m
1
+m
2
)
2
4×(m
1
m
2
)
=
(4m+2m)
2
4×(4m)×2m
=
36m
2
32m
2
=
9
8
...
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