# #

Consider a system of two pucks on a frictionless surface. An orange puck moving with velocity $$\vec{v\_{oi}}$$ collides with a blue puck that is initially at rest. At the time of the collision, a small explosion injects $$J$$ of energy into the system. Afterwards, the pucks move as shown in the figure below.

##### Long Description of image: Figure of the system described.
Before the collision. The orange puck moves with horizontal velocity voi (o for orange and i for initial) towards the right. The blue puck is at rest.
After the collision. Both pucks move in opposite directions. The orange puck moves with a velocity vof (f for final) at an angle theta with respect to the positive x-axis. The blue puck moves with a velocity vbf (b for blue) at an angle phi with respect to the positive x-axis.

Long description ends.

## Part 1#

Which of the statements below best describes how the system’s momentum and kinetic energy change after the collision and explosion?