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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.
A) What was the change in the fullbacks momentum?
B) What Was the change in the defensive momentum?
C) What was the defensive tackle's original momentum?
D) How 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 kg*m/s (a 

He got stopped Change in Mo = 779 kg*m/s (b 

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

- 779 = 128 * v 
v= - 6.09 m/s (e