A 99-kg fullback, running at 8.2 m/s, collides in midair with a 126-kg defensive

Question

A 99-kg fullback, running at 8.2 m/s, collides in midair with a 126-kg defensive tackle moving in the opposite direction. Both players end up with zero speed.
(a) Identify the "before" and "after" situations and draw a diagram of both. (Do this on paper. Your instructor may ask you to turn in this diagram.)
This answer has not been graded yet.

(b) What was the fullback's momentum before the collision?
kg · m/s

(c) What was the change in the fullback's momentum?
kg · m/s

(d) What was the change in the defensive tackle's momentum?
kg · m/s

(e) What was the defensive tackle's original momentum?
kg · m/s

(f) How fast was the defensive tackle moving originally?
m/s

Explanation / Answer

initial momentu=final momentum =>99*8.2+126*v=0 =>v=-6.44 a>99*8.2=811.8 b>0-99*8.2=-811.8 c>0-126*-6.44=811.8 d>126*-6.44=-811.8 e>-6.44

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