A moving object of mass m strikes at another stationary object of mass 2m with velocity 20m/s. If initial kinetic energy of moving object of mass m be 200J, then find kinetic energy of the object of mass 2m after the collision of the two objects.
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Answer:
Correct option is B)
For elastic collision, the kinetic energy is conserved.
Kinetic energy conservation along horizontal:
2
1
(2m)U
2
+
2
1
m0
2
=
2
1
(2m)(ucos30
o
)
2
+
2
1
m(vcos60
o
)
2
or 2mU
2
=2mu
2
(
2
3
)
2
+mv
2
(1/2)
2
or 2U
2
=(3/2)u
2
+(1/4)v
2
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