An object travels North at #7 m/s# for #4 s# and then travels South at #3 m/s# for # 7 s#. What are the object's average speed and velocity?

1 Answer
Sep 30, 2017

Answer:

Average speed = 4.45 m/s
Average velocity = 0.63 m/s

Explanation:

Distance travelled along north = Speed × Time
= 7 m/s × 4s
= 28 m

Distance travelled along south = Speed × Time
= 3m/s × 7s
= 21 m

Average speed = #text (Total distance) / text(Total time)#

= #(28m + 21m) / (4s + 7s)#

= 4.45 m/s


Displacement = 28 m North - 21 m South
= 7 m north

Average velocity = #text(Displacement) / text(Total time)#

= #(7m) / (4s + 7s)#

= 0.63 m/s