1.

A body of mass 5kg is at rest.suddenly it explodes in to two pieces of mass 2kg and 3 kg.2 kg body moves with velocity 3m/s​

Answer»

ong>Answer:

Given : m

1

=2kg m

2

=1kg u

1

=3 m/s u

2

=4 m/s

Let the COMMON velocity of the combined BODY be V

Mass of combined body M=2+1=3kg

Applying conservation of MOMENTUM :

2×3−1×4=3×V ⟹V=

3

2

m/s

Momentum of the system P=2×3−1×4=2 kg m/s

Loss in kinetic energy of the system due to collision ΔK.E=K.E

i

−K.E

f

ΔK.E=

2

1

(2)×3

2

+

2

1

(1)×4

2

−

2

1

(3)×(

3

2

)

2

⟹ΔK.E=

3

49

J

solution


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