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**1. Two blocks of masses 8 kg and 5.9 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 5.9 kg

moves to the right with a speed of 20 m/s.

What is the velocity of the other mass in

m/s?

Answer in units of m/s.

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 5.9 kg

moves to the right with a speed of 20 m/s.

What is the velocity of the other mass in

m/s?

Answer in units of m/s.

**2. m**

_{1}v_{1f}+m_{2}v_{2f}=m_{1}v_{1i}+m_{2}v_{2i}_{ 3. the blocks of masses m sub 1 and m sub 2 are connected by a cord with a spring between them. i assumed that they are initially at rest due to the cord. so the initial portion of the above equation would be 0 as their velocities would be 0. solving for v sub 2 final i get m1v1f/m2 =v2f. i get 14.75 m/s. this is incorrect. }