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Work-Kinetic Energy and Collisions!

Time for our weekly youtube problems. This week, a selection of four problems to admire.

First, using the Work-Energy theorem to figure out how fast an object moves after being pushed when there is friction.

Second, using conversation of energy with a spring to figure out the speed of a mass at different displacements. Nice problem with a position-dependent potential.

Third, a football tackle modeled as an inelastic collision.

Four, a head-on elastic particle collision.