Help with physics word problem

Physics
Tutor: None Selected Time limit: 1 Day

Two blocks of masses 7 kg and 25 kg 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
isburned, after which the block of mass 25kg
moves to the right with a speed of 27 m/s.
What is the velocity of the other mass in
m/s?
Answer in units of m/s.

Jun 30th, 2015

Thank you for the opportunity to help you with your question!

The Principle of momentum conservation is applicable here.

m1 v1 + m2 v2 = 0

7 x v1 + 25 x 27 =0

hence, v1 = - 96.43 m/s to the left.



Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 30th, 2015

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