A Block of Mass,m,is Pushed Up Against a Spring,compressing It

question 18

Multiple Choice

A block of mass,m,is pushed up against a spring,compressing it a distance x,and 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 4m,giving it a speed 3v.What distance was the spring compressed in the second case?

• A)x
• B)2x
• C)3x
• D)4x
• E)6x

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