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Two blocks have masses of $M$ and $2M$ and are initially at rest on a frictionless horizontal counter. The masses are exploded​ apart by releasing a spring between them.

Which one of the following is true regarding the speeds of the blocks as they move away from each other?

A

The blocks move away from each other at the same speed.

B

The $M$ block moves away at twice the speed of the $2M$ block.

C

The $M$ block moves away at four times the speed of the $2M$ block.

D

The $2M$ block moves away at twice the speed of the $M$ block.

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