What is the speed of an object that travels from $( 6, -3, 1)$ to $(-1,5,-1 )$ over $4 s$ ?

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Answer 1 · 2016-01-15T11:35:37

It is only possible to infer the average velocity.

$"Average speed" = sqrt{117}/4 "s"^{-1}$

$"Displacement" = -7i + 8j - 2k$

$"Average velocity" = (-7/4i + 2j - 1/2k)"s"^{-1}$

$"Distance travelled" = sqrt{(-7)^2+8^2+(-2)^2}$

$= sqrt{117}$

$"Average speed" = sqrt{117}/4 "s"^{-1}$

What is the speed of an object that travels from ( 6, -3, 1) ( 6, -3, 1) to (-1,5,-1 ) (-1,5,-1 ) over 4 s4 s?