anonymous
  • anonymous
Mhm
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
\[\text{Total area} = X + Y \implies \frac{ 1 }{ 2 }t(\vec v_f- \vec v_i) +\vec v_i t\]
anonymous
  • anonymous
Where total area is displacement
anonymous
  • anonymous
\[\vec d = \frac{ \vec v_f t }{ 2 }- \frac{ \vec v_i t }{ 2 }+v_i t\] \[\vec d = \frac{ \vec v_f t }{ 2 }+\frac{ \vec v_i t }{ 2 } = \left( \frac{ \vec v_f + \vec v_i }{ 2 } \right)t\] \[\text{Therefore} ~ \vec d = \left( \frac{ \vec v_f + \vec v_i }{ 2 } \right)t\]

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anonymous
  • anonymous
Ah, so now similarly can derive the other equations of uniform motion, using just the graphs :).
anonymous
  • anonymous
|dw:1437888152528:dw|Using above being derived from
anonymous
  • anonymous
Well we can derive \[\vec d = \vec v_i t + \frac{ 1 }{ 2 } \vec at^2\] and then to find \[\vec v_f ^2= \vec v_i^2+ 2a \vec d\] we can substitute \[\vec a = \frac{ \vec v_f - \vec v_i }{ t } \] into \[\vec d = \vec v_i t + \frac{ 1 }{ 2 } \vec a t^2\]

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