# Homework Help: X-y components after a collision

1. May 27, 2005

### MAPgirl23

Spheres A (mass 0.020 kg), B (mass 0.030 kg), and C (mass 0.050 kg), are each approaching the origin as they slide on a frictionless air table. The initial velocities of A and B are 1.50 m/s and 0.50 m/s. All three spheres arrive at the origin at the same time and stick together.

a) What must the x-component of the initial velocity of C be if all three objects are to end up moving at 0.50 m/s in the +x-direction after the collision?

b) What must the y-component of the initial velocity of C be if all three objects are to end up moving at 0.50 m/s in the +x-direction after the collision?

c) If C has the velocity found in parts (A) and (B), what is the change in the kinetic energy of the system of three spheres as a result of the collision?

2. May 27, 2005

### arildno

Nice questions; what have you done on your own?

3. May 27, 2005

### Corneo

Perhaps I am not understanding this question correctly enough. Does the problem give the initial directions of the three masses? It would seem like you need them, so the components can add correctly.

4. Jun 1, 2005

### MAPgirl23

I understand how to do it now