What is the speed of an object that travels from ( -4,6,2) to ( -3, 9,-6 ) over 3 s?

1 Answer
David G.
Jul 19, 2016

The displacement from one point to the other is d=sqrt((x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2)=sqrt((-3-(-9))^2+(9-6)^2+(-6-2)^2)
=sqrt(36+9+64)=sqrt(109)~~10.44 units.

Speed = distance/time = 10.44/3=3.5 ms^-1.

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