An object travels North at $6$ $ms^-1$ for $2$ $s$ and then travels South at $3$ $ms^-1$ for $4$ $s$ . What are the object's average speed and velocity?

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An object travels North at $6$ $ms^-1$ for $2$ $s$ and then travels South at $3$ $ms^-1$ for $4$ $s$ . What are the object's average speed and velocity?

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Answer 1 · 2016-06-23T11:26:39

The total distance traveled, if direction is not important, is $24$ $m$ in $6$ $s$ , for an average speed of $4$ $ms^-1$ .

The total displacement of the object from its starting point, after traveling North $12$ $m$ and South $12$ $m$ , is $0$ $m$ in $6$ $s$ , for an average velocity of $0$ $ms^-1$ .

Explanation:

Distance traveled North: $v=d/t$ , rearranged, $d=vt=6*2=12$ $m$

Distance traveled South: $d=vt=3*4=12$ $m$

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An object travels North at $6$ $ms^-1$ for $2$ $s$ and then travels South at $3$ $ms^-1$ for $4$ $s$ . What are the object's average speed and velocity?

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An object travels North at $6$ $ms^-1$ for $2$ $s$ and then travels South at $3$ $ms^-1$ for $4$ $s$ . What are the object's average speed and velocity?