An object travels North at # 3 m/s# for #9 s# and then travels South at # 5 m/s# for # 2 s#. What are the object's average speed and velocity?

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Answer 1 · 2018-02-26T16:36:43

See the explanation below

The total distance travelled is

#d=(3*9)+(5*2)=27+10=37m#

The total time is

#t=9+2=11s#

The average speed is #=d/t=37/11=3.36ms^-1#

The distance travelled is

#d_1=3*9-5*2=27-10=17m#

The time is the same

#t=11s#

The average speed is

#=d_1/t=17/11=1.55ms^-1#