An object travels North at # 12 m/s# for #1 s# and then travels South at # 5 m/s# for # 7 s#. What are the object's average speed and velocity?

1 Answer
Apr 25, 2016

Answer:

Average speed #5 7/8 m/s#
Average velocity #2 7/8 m/s "South"#

Explanation:

Distance traveled #= 12 m/sxx1 s + 5 m/sxx7s = 47 m#
Total time#= 1 s+7 s= 8 s#
Average speed# = (47m)/(8s) =5 7/8 m/s#

Displacement #= 12 m "North" + 35 m "South" = -12 m "South" +35 m "South" = 23 m "South"#
Average velocity #= (23m)/(8s)= 2 7/8 m/s "South"#