A 10 g bullet moving horizontally with a speed of 2000 m/s strikes and passes through a 4.0 kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block. Round off your answer to zero decimal places.

The answer is "512 J".

Explanation:

bullet mass

initial speed

block mass

initial speed

final speed

Let will be the bullet speed after collision:

throughout the consevation the linear moemuntum

The kinetic energy of the bullet in its emerges from the block

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none, its a machine