Physics Word Problem

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
is burned, 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
Answer in units of m/s.

Jun 30th, 2015

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

the momentum and energy is conserved during the motion

M1V1+m2V2 =0 

7*V1+25*27 = 0 

V1 = -25*27/7 =  -96.4 m/s 

negative means the velocity is 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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