Solving Collision Between 120kg Tackler and 75kg Halfback

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The discussion focuses on calculating the common speed after a collision between a 120 kg tackler and a 75 kg halfback using the conservation of momentum formula: (M1 x U1) + (M2 x U2) = (M1 x V1) + (M2 x V2). Here, M1 represents the mass of the tackler, U1 is the tackler's speed of 3 m/sec, M2 is the halfback's mass, and U2 is the halfback's speed of 6 m/sec. By applying the formula correctly, users can determine the post-collision speed of both players.

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rueberry
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I have been working on this for some time, maybe I'm just using the wrong formula.

A 120 kg tackler traveling 3 m/sec tackles a 75 kg halfback running 6m/sec in the opposite direction. What is their common speed immediately after the collison?

Thank you.
 
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Use the formula

(M1 x U1) + (M2 + U2) = (M1 x V1) + (M2 x V2), Conservation of momentum formula.

where M1 = Tackler Mass
M2 = Halfback Mass
U1 = Tackler Speed
U2 = Halfback speed
V1 = V2 (since the speed after colision is common) = Speed of both of them after the collision.
 

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