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

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Answer 1 · 2017-06-12T09:32:21

The average speed is $=6.5625ms^-1$
The average velocity is $=1.3125ms^-1$

The average speed is $=$ total distance $/$ time,

The total distance is $d=(7*9)+(6*7)=105m$

The total time is $t=9+7=16s$

The average speed is $=d/t=105/16=6.5625ms^-1$

The average velocity is

$barv=(Deltax)/(Deltat)=(7*9-6*7)/(9+7)=21/16=-1.3125ms^-1$

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 7 s 7 s. What are the object's average speed and velocity?