Question

An object travels North at `1 m/s` for `3 s` and then travels South at `2 m/s` for `4 s`. What are the object's average speed and velocity?

Answer 1

See below....

Explanation:

As the object goes through north,he overcame the distance `(1×3)=3m`
As the object goes through south, he overcame `(4×2)=8m`
Hence,its net displacement is `(8-3)=5m` by south.
Its average speed is (distance covered/time)=`(8+3)/(3+4)=1.57ms^-1`
and average velocity is(displacement/time) `=5/(3+4)=0.71ms^-1`