A bullet of mass 10 g moving horizontally with a velocity of 400 
strikes a wood block of mass 2 kg which is suspended by light inextensible string of length 5 m. As a result, the centre of gravity of the block found to rise a vertical distance of 10 cm. The speed of the bullet after it emerges out horizontally from the block will be (NEET‐II2016)
Text Solution
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: Mass of bullet, 
kg
Initial speed of bullet, 
Mass of block, 
kg
Length of string, 
Speed of the block after collision 
Speed of the bullet on emerging from block, 
?
Using energy conservation principle for the block,
or, 
Using momentum conservation principle for block and bullet system,
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