Answer to Question #253370 in Mechanics | Relativity for Cassy

Question #253370

A car’s odometer (the meter that measures the distance traveled by the car) reads 25,943 km at the start of a trip. It the reads 26,246 km at the end of the trip. The entire trip took a total of 3.5 hours. Determine the car’s average speed in units of (a) km/h and (b) m/s.


1
Expert's answer
2021-10-19T15:12:36-0400

Given:

xi=25943kmx_i=25\:943\:\rm km

xf=26246kmx_f=26\:246\:\rm km

t=3.5hrt=3.5\:\rm hr


The average speed

v=xfxitv=\frac{x_f-x_i}{t}

(a)

v=26246km25943km3.5hr=86.6km/hrv=\rm\frac{26\:246\: km-25\:943\: km}{3.5\: hr}=86.6\: km/hr

(b)

86.6km/hr=86.61000m3600s=24.0m/s\rm 86.6\: km/hr=86.6*\frac{1000\: m}{3600\: s}=24.0\: m/s


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