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A 110-kg tackler moving at a speed of 2.5 m/s meets head-on (and holds on to)...

A 110-kg tackler moving at a speed of 2.5 m/s meets head-on (and holds on to) an 90-kg halfback moving at a speed of 5.0 m/s.What will be their mutual speed immediately after the collision? Express your answer to two significant figures and include the appropriate units.

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