(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A mass(1) of 10000kg with a velocity 30m/s west collides with another mass(2) of 1200kg with a velocity 20m/s north. After the collision the two masses stick together. Determine the change in momentum of mass(2) before and after the collision.

2. Relevant equations

General momentum equations:

p = mv

Δp = p_{f}- p_{i}

3. The attempt at a solution

p_{i}(mass 2) = mv = 1200 * 20 = 24000sN North

final velocity was calculated to be 26.87m/s 274.6°T (using LCM and some trig)

Therefore, p_{f}(mass 2) = 1200 * 26.87 = 32244sN 274.6°T

to calculate change in momentum:

Δp = p_{f}- p_{i}

Δp = (32244sN 274.6°T) + (24000sN South)^{Note, changed to from North to south as it was -pi}

Using a vector diagram, I found the resultant vector, Δp, to be 38621sN 226.7°T.

I am not sure that I am doing this right though. After some searching on the internet, some people calculated change in momentum by adding initial and final vectors. But isn't that just net momentum?

please help!

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# Homework Help: Calculating change in momentum

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