An object travels North at $8 m/s$ for $7 s$ and then travels South at $4 m/s$ for $3 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-06-28T11:35:13

The average speed is $=6.8ms^-1$
The average velocity is $=4.4ms^-1$

The total distance travelled is $d=8*7+4*3=68m$

The total time is $t=7+3=10s$

The average speed is

$barv=d/t=68/10=6.8ms^-1$

The displacement is

$Deltax=8*7-4*3=44m$

The average velocity is

$=(Deltax)/t=44/10=4.4ms^-1$

An object travels North at 8 m/s8 m/s for 7 s7 s and then travels South at 4 m/s4 m/s for 3 s3 s. What are the object's average speed and velocity?