Physics

Problem

0.40\,\text{kg}

puck slides due east on frictionless ice at

5.0\,\text{m/s}

and collides elastically with a

0.20\,\text{kg}

puck that is initially at rest. After the collision, the

0.40\,\text{kg}

puck is observed to move at

3.0\,\text{m/s}

at an angle of

30^{\circ}

north of east. At what angle, measured from the east direction, does the

0.20\,\text{kg}

puck move immediately after the collision? (A positive angle is north of east, a negative angle is south of east.) a)

-48^{\circ}

-32^{\circ}

+32^{\circ}

-60^{\circ}