An object travels North at #2 m/s# for #9 s# and then travels South at #4 m/s# for #1 s#. What are the object's average speed and velocity?

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Answer 1 · 2018-02-01T09:20:22

The average speed is #=2.2ms^-1#.
The average velocity is #=1.4ms^-1#

The total distance travelled

#s=(2*9)+(4*1)=18+4=22m#

The total time is

#t=t_1+t_2=9+1=10s#

The average speed is

#baru=s/t=22/10=2.2ms^-1#

The real distance travelled is

#d=(2*9)-(4*1)=18-4=14m#

The total time is

#t=t_1+t_2=9+1=10s#

The average velocity is

#barv=d/t=14/10=1.4ms^-1#