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Q. A ball of mass 0.640 kg moving east (+x direction) with a speed of 3.50 m/s collides head-on with a 0.84 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?

Q. A hydraulic lift has pistons with areas 0.70 m^2 and 5.10 m^2, and they are at the equal height. With a 2.20 force on the smaller piston, how much mass can the larger piston support?

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