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A block of mass m is pushed up agains a ...

A block of mass m is pushed up agains a spring, compressing it by a distance x, and the block is then released. The spring projects the block along a frictionless horizontal surface, giving the block a speed v. The same spring projects a second block of mass 4 m, giving it a speed 3v. What distance was the spring compressed in the second case?

A

6x

B

`(x)/(6)`

C

36x

D

12x

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The correct Answer is:
A
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