- #1

Manh

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## Homework Statement

Two solid spheres hung by thin threads from a horizontal support (Figure 1) are initially in contact with each other. Sphere 1 has inertia m1 = 0.040 kg , and sphere 2 has inertia m2 = 0.10 kg. When pulled to the left and released, sphere 1 collides elastically with sphere 2. At the instant just before the collision takes place, sphere 1 has kinetic energy K1 = 0.086 J .

A. What is the speed of sphere 1 after the collision?

B. What is the speed of sphere 2 after the collision?

## Homework Equations

K = 1/2 mv^2

p = mv

## The Attempt at a Solution

I found v1i = 2.07 m/s

Should I consider of using these equations?

Kinetic:

1/2 m1*v1i^2 + 1/2 m2*v2i^2 = 1/2 m1*v1f^2 + 1/2 m2*v2f^2

Momentum:

m1*v1i + m2i*v2i = m1*v1f + m2*v2f