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A 95 kg fullback, running at 8.2 m/s, collides in midair with a 128 kg defensive tackle moving in the opposite direction. Both players end up with zero speed.

AWhat was the change in the fullbacks momentum?
BWhat Was the change in the defensive momentum?
CWhat was the defensive tackle's original momentum?
DHow fast was the defensive tackle moving origianally? ...?

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Below is the answers:

Fullback running 

Mo = mass velocity 
Mo = 95kg 8.2 m/s =779 kgm/s (a 

He got stopped Change in Mo = 779 kgm/s (b 

Both stopped ===> Tackle's mo = - Halfback's Mo = - 779 kgm/s (c & d 

- 779 = 128 v 
v= - 6.09 m/s (e

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