An object travels North at $4 m/s$ for $3 s$ and then travels South at $1 m/s$ for $6 s$ . What are the object's average speed and velocity?

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Answer 1 · 2018-01-02T07:41:06

The average speed is $=2ms^-1$ . The average velocity is

$=2/3ms^-1$

The total distance travelled is

$d=(4*3+1*6)=12+6=18m$

The time taken for the whole journey is

$t=3+6=9s$

The average speed is

$barv="total distance travelled "/"total time taken"=18/9=2ms^-1$

The effective distance travelled is

$d_(eff)=4*3-1*6=12-6=6m$

The time taken is

$t=9s$

The average velocity is

$="effective distance travelled"/"time taken"=6/9=2/3ms^-1$

An object travels North at 4 m/s4 m/s for 3 s3 s and then travels South at 1 m/s1 m/s for 6 s 6 s. What are the object's average speed and velocity?