Question

A 0.2-kg hockey puck is sliding along the ice with an initial speed of 12 m/s when a player strikes it with his stick, causing it to reverse its direction and giving it a speed of 23 m/s. The impulse the stick applies to the puck is most nearly

Answer 1

Answer:

The impulse the stick applies to the puck is 7 kg-m/s and it is in opposite direction                                

Explanation:

Given that,

Mass of the hockey puck, m = 0.2 kg

Initial speed of the hockey, u = 12 m/s

Final speed of the hockey, f = -23 m/s (as it reverse its direction)

We need to find the impulse the stick applies to the puck. It is given by the change in momentum of the object. It is given by :

$J=m(v-u)$

$J=0.2\ kg\times (-23-12)\ m/s$

J = -7 kg-m/s

So, the impulse the stick applies to the puck is 7 kg-m/s and it is in opposite direction. Hence, this is the required solution.