Along a straight road through town, there are three speed-limit signs. They occu

Question

Along a straight road through town, there are three speed-limit signs. They occur in the following order: 63 , 36 , and 25 mi/h, with the 36 -mi/h sign located midway between the other two. Obeying these speed limits, the smallest possible time tA that a driver can spend on this part of the road is to travel between the first and second signs at 63 mi/h and between the second and third signs at 36 mi/h. More realistically, a driver could slow down from 63 to 36 mi/h with a constant deceleration and then do the same thing from 36 to 25 mi/h. This alternative requires a time tB. Find the ratio tB/tA

Explanation / Answer

http://wc.pima.edu/~solson/phy121/hw/hw02.pdf

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