Attempting to score a touchdown, an 85-kg tailback jumps over his blockers, achieving a horizontal speed of 8.9 m/s. He is met in midair just short of the goal line by a 110-kg linebacker traveling in the opposite direction at a speed of 8.0 m/s. The linebacker grabs the tailback.
a) What is the speed of the entangled tailback and linebacker just after the collision?
b) Will the tailback score a touchdown (provided that no other player has a chance to get involved, of course)?
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