An object travels North at $9 m/s$ for $2 s$ and then travels South at $7 m/s$ for $3 s$ . What are the object's average speed and velocity?

Question

1295 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-04T12:15:46

The average speed is $=7.8ms^-1$ . The average velocity is $=0.6ms^-1$

The total distance travelled is

$d=(9*2)+(7*3)=18+21=39m$

The total time is $t=2+3=5s$

The average speed is

$barv=d/t=39/5=7.8ms^-1$

The effective distance travelled is $d_1=18-21=-3m$

The average velocity is $v_1=|d_1|/t=3/5=0.6ms^-1$

An object travels North at 9 m/s9 m/s for 2 s2 s and then travels South at 7 m/s7 m/s for 3 s 3 s. What are the object's average speed and velocity?