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#