What is the speed of an object that travels from #( 8,-4,2) # to #( 7,-3,6 ) # over #3 s#? Physics 1D Motion Displacement and Velocity 1 Answer ali ergin Feb 29, 2016 #v=sqrt 2 m/s# Explanation: #"Distance the point (8,-4,2) and (7,-3,6) may be calculated using:"# #Delta x=sqrt((7-8)^2+(-3+4)^2+(6-2)^2)=sqrt(1+1+16)=sqrt 18 m# #"The speed of an object is given by :"v=(Delta x)/t# #v=sqrt 18/3# #v=sqrt (9*2)/3# #v=3*sqrt 2/3# #v=sqrt 2 m/s# Answer link Related questions What is the difference between distance and displacement? Is displacement directly proportional to velocity? How does average velocity differ from instantaneous velocity? How can I calculate the change of velocity? How do speed and velocity differ from each other? How do velocity and acceleration differ? How do displacement and distance differ? Can displacement be negative? Can velocity be zero if accelerating? Explain why displacement is a vector quantity? See all questions in Displacement and Velocity Impact of this question 198 views around the world You can reuse this answer Creative Commons License