Standing on a balcony, you throw your keys to a friend standing on the ground below. one second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. what initial velocity did you give them?
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True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Which lists the amplitudes of sound waves from these sources in order from greatest to least? busy roadway, kids whispering, average home chainsaw, diesel truck, rustling leaves kids whispering, vacuum cleaner, jet airplane library, conversational speech, music from speaker

Cho is making a bar graph showing the amount of money spent on health care between 1999 and 2005. the dependent variable is the: a: money spent b: year c: number of patients