physics

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Two blocks of masses m and M [M = 4.23m]
are placed on a horizontal, frictionless surface.
A light spring is attached to one of them, and
the blocks are pushed together with the spring
between them. A cord holding them together
is burned, after which the block of mass M
moves to the right with a speed of 2.35 m/s.

What is the speed of the block of mass m?

• physics -

[M = 4.23m]
makes no sense.
Mass is not measured in meters.

In a frictionless situation, total momentum is conserved.

• physics -

multiple M and the velocity
9.9405

• physics -

Answering to drwls late, but 4.23m, the m is mass of m but it's 4.23 times greater. Hence, 4.23m.

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