An object travels North at $4 m/s$ for $9 s$ and then travels South at $6 m/s$ for $2 s$ . What are the object's average speed and velocity?

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Answer 1 · 2016-05-15T04:54:53

Average Speed $=48/11=4.bar36$ m/sec
Average Velocity $=24/11=2.bar18" "$ m/sec directed North

The given data

Directed North $v_1=4" "$ m/sec for time $t_1=9" "$ sec
Directed South $v_2=6" "$ m/sec for time $t_2=2" "$ sec

distance $d_1=v_1*t_1=4*9=36" "$ m
distance $d_2=v_2*t_2=6*2=12" "$ m

Average speed $=(d_1+d_2)/(t_1+t_2)=(36+12)/(9+2)=48/11=4.bar36" "$ m/sec

Average Velocity $=(+36+(-12))/(9+2)=24/11=2.bar18" "$ m/sec

God bless....I hope the explanation is useful.

An object travels North at 4 m/s4 m/s for 9 s9 s and then travels South at 6 m/s6 m/s for 2 s 2 s. What are the object's average speed and velocity?