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Which situations from the list is mechanical energy conserved
A ball slides down a hill with friction
The moon orbits the earth
A child swings on a frictionless swing, ignoring air resistance
An ice skater glides along the ice
A ball is dropped from a certain height and bounces back to a lower height
A ball slides down a frictionless hill
2, 3, 4, and 6
Adam and Bobby are twins who have the same weight. Adam drops to the ground from the tree at the same time that Bobby begins his decent down a frictionless slide. If they both start at the same height above the ground, how do their kinetic energies compare when they hit the ground.