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If a 28-watt lightbulb is left on for the whole month of July, how many joules of energy would it use up? A 160-pound dad

If a 28-watt lightbulb is left on for the whole month of July, how many joules of energy would it use up?

A 160-pound dad is 2 meters from the center of a seesaw. Where should he place his 40-pound kid in order that there will be balance?

A 12kg package falls off a 7-meter roof. How fast will it hit the ground?

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