An object travels North at $7 m/s$ for $9 s$ and then travels South at $6 m/s$ for $2 s$ . What are the object's average speed and velocity?

Question

1401 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-08-26T18:04:15

$"Average Speed"= 75/11 m/s$
$"Average Velocity"=51/11 m/s$

Object Travel North
Time taken = 9 s
speed = 7 m/s
Travel Distance = $speed * time=7*9=63 m$

Object Travel South
Time taken = 2 s
speed = 6 m/s
Travel Distance = $speed * time=6*2=12 m$

$"Average Speed"= "total distance "/ "total time" =(63+12)/(9+2)=75/11 m/s$

Displacement
object travel 63 m towards North and 12 m towards south
$total displacement=63-12=51 m$

$"Average Velocity"="Total displacement"/"total time" =(63-12)/(9+2)=51/11 m/s$

An object travels North at 7 m/s7 m/s for 9 s9 s and then travels South at 6 m/s6 m/s for 2 s 2 s. What are the object's average speed and velocity?