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

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Answer 1 · 2018-04-23T08:59:02

Please see the explanation below.

The total distance travelled is

$d=(3xx7)+(4xx4)=37m$

The time to cover this distance is

$t=7+4=11s$

The average speed is

$barv=d/t=37/11=3.36ms^-1$

The effective distance travelled is

$d_1=(3xx7)-(4xx4)=5m$

The average velocity is

$v_a=d_1/t=5/11=0.45ms^-1$

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