Answer to Question #253370 in Mechanics | Relativity for Cassy

Question

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.

Answer 1

Given:

$x_i=25\:943\:\rm km$

$x_f=26\:246\:\rm km$

$t=3.5\:\rm hr$

The average speed

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

(a)

$$v=\rm\frac{26\:246\: km-25\:943\: km}{3.5\: hr}=86.6\: km/hr$$

(b)

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