May 31, 2016

Homework Help: physics

Posted by Vishnu on Wednesday, October 8, 2008 at 12:43am.

Larry leaves home at 2:08 and runs at a constant speed to the lamppost. He reaches the lamppost at 2:15, immediately turns, and runs to the tree. Larry arrives at the tree at 2:29. What is Larry's average velocity during his trip from home to the lamppost, if the lamppost is 308.0 m west of home, and the tree is 688.0 m east of home?


velocity is change of position (a vector) per time.

change of position: final position-initial
= 688E+308W=380W

avgvelocity=380W/total time.

I got

avgvelocity = 380W/ total time
= 380 / 21 seconds
= 18.1 m/s

Why is my answer incorrect?

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