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Q.

A shell of mass 200g is ejected from a gun of mass 4kg by an explosion that generates 1.05 KJ of energy. The initial velocity of the shell is

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a

80 m/s

b

40 m/s

c

100 m/s

d

120 m/s

answer is C.

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Detailed Solution

After explosion mv=MVR⇒VR=mmv

 Total K.E=12mv2+12mvR2=1.05×103

12mv2+12mmMv2=1.05×103

⇒v2=1002⇒v=100m/s

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