Posted by **Anonymous** on Wednesday, February 23, 2011 at 4:21pm.

A 120-kg tackler moving at 5 m/s meets head-on (and tackles) a 80-kg halfback moving at 5 m/s, after which they couple together.

What will be their mutual speed after the collision?

Hint: use conservation of momentum law for INELASTIC collision.

- physics -
**Dan B**, Wednesday, November 14, 2012 at 12:37pm
Mass1(tackler) x V1(tackler) + M2(halfback) x V2(halfback) = (M1 + M2) x V(combined)

or

m1(v1) x m2(v2) = (m1+m2)v

=== solve for v ====

(remember, they are running in opposite directions, one velocity should be in the negative direction)

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