"Speed of an object is given as " v=("distance")/("time elapsed")
"distance between (-9,0,1) and (-1,4,-6) is:"
Delta x=sqrt((-1+9)^2+(4-0)^2+(-6-1)^2)
Delta x=sqrt(8^2+4^2+(-7)^2)
Delta x=sqrt(64+16+49)
Delta x=sqrt(129)
Delta x=11.36" unit"
v=(11.36)/(2)
v=5.68 " unit"/s