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

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

An object travels North at 3 m/s 3 m/s for 9 s9 s and then travels South at 5 m/s 5 m/s for 2 s 2 s. What are the object's average speed and velocity?