# Momentum problem

haruspex
Homework Helper
Gold Member
The horizontal before the split was 0 cause it was going vertical

For one of the pieces I did now

P=mv
(0.5)(25)
=12.5

Then
12.5sin7.5

I get as a horizontal 1.6315
Good. Stop there. You have answered the question.
Then subtract

1.6315-(-1.6315) = 3.263

so the answer to my question of change in momentum would be the 3.263

mfb
Mentor
The sine is not the right trigonometric function...
The right function will give a similar, but not the same result.

so the answer to my question of change in momentum would be the 3.263
No, see haruspex' post. The change for each piece is from 0 to [value close to 1.6 kg m/s], and that value close to 1.6 is the right answer.

haruspex
Homework Helper
Gold Member
so the answer to my question of change in momentum would be the 3.263
No, I said "stop there" after you wrote
horizontal 1.6315
You should add the units, but otherwise that's it: the magnitude and direction of the change in momentum of each part (but they will have opposite signs, of course).

ok so i leave it as is at 1.6315 or do i add 1.6315 + 1.6315 to get the final answer

mfb
Mentor

There is a different problem:
The sine is not the right trigonometric function...
The right function will give a similar, but not the same result.

alright i did 12.5tan7.5 = 1.6457 kg m/s

haruspex