# Calculate momentum of the puck

1. Apr 24, 2016

### rrosa522

1. The problem statement, all variables and given/known data
A hockey player passes a puck with an average force of 250N. The hockey stick is in contact with the puck for 0.0030s, and the mass of the puck is 180g. The puck is not moving before the player hits it.

a) Determine the impulse imparted by the hockey stick.
b)Calculate the momentum of the puck as a result of the collision

2. Relevant equations
p=mv

3. The attempt at a solution
I got 0.75 kg*m/s for the part A but I don't know what to do for part B. Shouldn't the answer be the same for both. I really don't understand the difference between both questions.

2. Apr 24, 2016

### Staff: Mentor

They want to see if you understand the relationship between impulse and momentum. Sounds like you do.

Yes, in this case. But what if the puck was at rest when it was hit?

3. Apr 24, 2016

### rrosa522

how can I find the momentum without knowing the velocity, the answer should be 4.2kg*m/s

4. Apr 24, 2016

### Staff: Mentor

You know the impulse, which is all you need. Review the impulse-momentum theorem.

5. Apr 24, 2016

### rrosa522

yes, but the answer in my book is 4.2. I just want to know if it is a mistake.

6. Apr 24, 2016

### Staff: Mentor

Looks to me like the book is mistaken.