A five kilogram block and a four kilogram block are placed at either end of a co

Question

A five kilogram block and a four kilogram block are placed at either end of a compressed spring. The system is initially at rest, and then released. If the four kilogram block moves off at 4 meters per second in the +x direction, what is the velocity of the other block? A five kilogram block and a four kilogram block are placed at either end of a compressed spring. The system is initially at rest, and then released. If the four kilogram block moves off at 4 meters per second in the +x direction, what is the velocity of the other block?

Explanation / Answer

considering both blocks as one system, we see that there is no net external force on the system

So momentum remains conserved

So

m1v1=m2v2

So

4*4=5*v

So

v=3.2m/s

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