Physics

Problem

2.0\,\text{kg}

hockey puck initially at rest is hit by a stick. The force exerted by the stick on the puck increases uniformly from

0

20\,\text{N}

0.40\,\text{s}

and then drops instantly to

0

. Neglecting friction, what is the speed of the puck just after the hit? a)

1.6\,\text{m/s}

4.0\,\text{m/s}

2.0\,\text{m/s}

0.8\,\text{m/s}