Running at 2.0 m/s, Marty, the 45.0-kg quarterback, collides with Biff, the 90.0-kg tackle, who...

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Running at 2.0 m/s, Marty, the 45.0-kg quarterback, collides with Biff, the 90.0-kg tackle, who is traveling at 7.0 m/s in the other direction. Upon collision, Biff continues to travel forward at 1.0 m/s. How fast is Marty knocked backwards?

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