Question

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​

Answer 1

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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