An object travels North at $1 m/s$ for $3 s$ and then travels South at $12 m/s$ for $7 s$ . What are the object's average speed and velocity?

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Answer 1 · 2018-03-01T06:41:52

See the explanation below

The total distance travelled is

$d=(1*3)+(12*7)=3+84=87m$

The total time is

$t=3+7=10s$

The average speed is $=d/t=87/10=8.7ms^-1$

The distance travelled is

$d_1=1*3-12*7=3-84=-81m$

The time is the same

$t=10s$

The average speed is

$=|d_1|/t=81/10=8.1ms^-1$

An object travels North at 1 m/s1 m/s for 3 s3 s and then travels South at 12 m/s12 m/s for 7 s7 s. What are the object's average speed and velocity?