What is the speed of an object that travels from #( -1, 7,2) # to #( -3, 4,7 ) # over #2 s#?

1 Answer
Feb 14, 2016

Answer:

#v=sqrt 10 #

Explanation:

#"distance between two point is given as:" #
#x=sqrt(Delta x^2+Delta y^2+ Delta z^2#
#Delta x=x_2-x_1=-3+1=-2#
#Delta y=y_2-y_1=4-7=-3#
#Delta z=z_2-z_1=-3-2#=-5
#x=sqrt((-2)^2⁺(-3)^2+(-5)^2)#
#x=sqrt (4+9+25)#
#x=sqrt40#
#v=x/t#
#v=sqrt 40/2#
#v=sqrt (4*10)/2=2*sqrt 10/2#
#v=sqrt 10 #