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

1 Answer
Bio
Jan 15, 2016

It is only possible to infer the average velocity.

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

Explanation:

#"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}#

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