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(I) A 130 -kg tackler moving at 2.5 $\mathrm{m} / \mathrm{s}$ meets head-on (and tackles) an 82 -kg halfback moving at 5.0 $\mathrm{m} / \mathrm{s} .$ What will be their mutual speed immediately after the collision?

0.4 $\mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 9

Linear Momentum

Motion Along a Straight Line

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

Keena M.

November 20, 2020

Cornell University

University of Michigan - Ann Arbor

University of Washington

Lectures

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Well, so in this one, we use momentum. Conservation. Initial momentum will be called final momentum. Initial momentum. Ah, will be the combined momentum. Um, off the halfback in the tackler and final momentum is the, uh our initial momentum of the some of their momentum. Momenta Final momentum will be their combined momentum. So er was called 1/2 back to know the Halfback by H. Liston Order Tackler Buy teas Considering the direction off the half back Positive, we have MH VH mass times velocity of half back minus cause tacklers moving in the opposite direction M t v t for the tackle on That's equal to MH plus m t times Ah, final velocity VF Ah! And so final velocity V f is just m h v h minus empty view t over the sum of the messes. So now we plug stuff in. Uh, we have 82 kilograms times five meters per second for the halfback minus 1 30 kilograms times uh, negative are, um 1 30 kilograms times negative 2.5 uh, meters per second for the tackler over 82 plus 1 30 killer pants. And this If you work it out, it will give you points 40 meters per second, 222 decimal places and that's it

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