Two pucks slide without friction on an air table

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Two pucks slide without friction on an air table. Puck X has mass

0.20\,\text{kg}

and moves east at

3.0\,\text{m/s}

. Puck Y has mass

0.40\,\text{kg}

and moves north at

4.0\,\text{m/s}

. They collide and stick together. What is the speed of the combined puck immediately after the collision? (a)

1.7\,\text{m/s}

(b)

2.8\,\text{m/s}

(c)

3.7\,\text{m/s}

(d)

5.0\,\text{m/s}