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Time is defined operationally to be that which is measured by clocks. The SI unit of time is the second, which is defined to be "the duration of $9, 192, 631, 770$ periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium $133$ atom."

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Why do my equations say that an object thrown at $30^o$ with velocity 30 m/s has a $y$ veloc... [closed]

problem) V0 is not split evenly between x and y at 450 (completely unintuitive but perhaps possible) My equation for y velocity is as follows: Vyt=0 = sin(α0)V0+axt Note α is the angle (to x axis), t is time
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